CBSE Class 10 Science Carbon and its Compounds MCQs

Question : C₃H₈ belongs to the homologous series of
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) Cyclo alkanes

Answer :  C

Question : A hydrocarbon should have a minimum of how many carbon atoms to show isomerism?
(a) Three
(b) Four
(c) Five
(d) Six

Answer :  B

Question : Ethane, with the molecular formula C2H6 has
(a) 6 covalent bonds.
(b) 7 covalent bonds.
(c) 8 covalent bonds.
(d) 9 covalent bonds.
Answer : B

Question : While cooking, if the bottom of the vessel is getting blackened on the outside, it means that
(a) the food is not cooked completely.
(b) the fuel is not burning completely.
(c) the fuel is wet.
(d) the fuel is burning completely.
Answer : B

Question : Butanone is a four-carbon compound with the functional group
(a) carboxylic acid.
(b) aldehyde.
(c) ketone.
(d) alcohol.
Answer : D

Question : Which one of the given is an unsaturated hydrocarbon?
(a) Acetylene
(b) Butane
(c) Propane
(d) Decane

Answer :  A

Question : Which is denatured spirit?
(a) ethanol only
(b) ethanol and methanol (50%)
(c) ethanol and methanol (5%)
(d) methanol only

Answer :  C 

Question : Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
(a) Addition reaction
(b) Substitution reaction
(c) Displacement reaction
(d) Oxidation reaction

Answer :  A

Question : Artificial flavour for orange is obtained from
(a) amyl acetate
(b) isoamyl valerate
(c) methyl butyrate
(d) octyl acetate

Answer :  D

Question : The odour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic
(c) Vinegar
(d) Kerosene

Answer :  C

Question : Ethanol reacts with Na metal to form
(a) CH₃ONa + H₂
(b) C₂H₅ONa + H₂
(c) CH₃COONa + H₂
(d) CH₃C00H + H₂O

Answer :  B

Question : IUPAC name of first member of homologous series of ketones is
(a) Ethanone
(b) methanone
(c) Propanone
(d) Butanone

Answer :  C

Question : Covalent compounds
(a) (a) have high melting and boiling point
(b) are mostly soluble in water
(c) are formed between atoms of metals and non-metals
(d) are formed by the sharing of electrons in the bonding atoms.

Answer :  D

Question : Rectified spirit is
(a) 50% ethanol
(b) 80% ethanol
(c) 95% ethanol
(d) 40 to 50% ethanol

Answer :  C 

Question : Why does carbon form compounds mainly by covalent bonding?
(a) There are four electrons in the outermost shell of carbon.
(b) It requires large amount of energy to form C4+ or C4–
(c) It shares its valence electrons to complete its octet.
(d) All the above

Answer :  D

Question : The First Member Of Alkyne Homologous Series Is:
(a) Ethyne
(b) Ethene
(c) Propyne
(d) Methane

Answer :  A

Question : The first member of the alkyne homologous series is
(a) propyne
(b) ethyne
(c) methane

Answer :  B

Question : Methane is ______
(a) Unsaturated compound
(b) nitrogen compound
(c) Saturated compound
(d) Ionic compound

Answer :  C

Question : The isomeric pair is
(a) Ethane and propane
(b) Propane and butane
(c) Ethane and ethane
(d) Butane and 2-methylpropane

Answer :  D

Question : From where can we get ethanol?
(a) Grapes
(b) Beet root
(c) Sugarcane
(d) Orange

Answer :  C

Question : The substance not responsible for the hardness of water is
(a) Sodium nitrate
(b) Calcium hydrogen carbonate
(c) Calcium carbonate Magnesium carbonate

Answer :  A

Question : Ethanol on oxidation gives
(a) Ethane
(b) Formalin
(c) Ethanoic acid
(d) Methane

Answer :  C

Question : Which of the given can be used for the denaturation of ethyl alcohol?
(a) Methyl alcohol
(b) Pyridines
(c) Copper sulphate
(d) All of these

Answer :  D

Question : Read The Following Sentences Carefully, And Choose The Incorrect One:
(a) Graphite is non-volatile, so, it can-not be used for lubricating.
(b) Graphite is used for making carbon electrodes or graphite electrodes in dry cells and electric arcs.
(c) Diamonds can be made artificially by subjecting pure carbon to very high pressure and temperature.
(d) Diamond “dies” are used for drawing thin wires like the tungsten filament of an electric bul(b)

Answer :  A

Question : Butanone is a four carbon compound with functional group:
(a) carboxylic acid
(b) alcohol
(c) ketone
(d) aldehyde

Answer :  C

Question : Compounds with _______ molecular formula with different structures called _______
(a) Same, structural isomerism
(b) Different, structural isomerism
(c) Same, monomeric structures
(d) Different, monomeric structures

Answer :  A

Question : While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:
(a) The food is not cooked completely
(b) The fuel is not burning completely
(c) The fuel is wet
(d) The fuel is burning completely

Answer :  B

Question : A molecule of ammonia (NH₃) has
(a) Only single bonds
(b) Only double bonds
(c) Only triple bonds
(d) Two double bonds and one single bond

Answer :  A

Which allotrope of carbon is in the form of the geodesic globe?
(a) Graphite
(b) Diamond
(c) Fullerene
(d) Carbon nanotube

Answer :  C

Question. The diagram given below shows the electron arrangement of the valence electrons in a molecule of compound PQ3. Which of the following pairs of elements could be P and Q ? 

          P               Q
(a) Argon           Neon
(b) Phosphorus  Hydrogen
(c) Nitrogen      Chlorine
(d) Sulphur      Oxygen

Answer : C

Question. Which of the following statements is correct about a substance that has a giant covalent structure? 
(a) All its ions are arranged in a giant three dimensional lattice.
(b) A large amount of energy is needed to break down the lattice structure.
(c) It conducts electricity in the molten state.
(d) It dissolves in water but is more soluble in organic solvents.

Answer : B

Question. Number of free electron(s) in each carbon atom in graphite is/are 
(a) two
(b) four
(c) one
(d) three.

Answer : C

Question. All the members of homologous series of alkynes have the general formula 
(a) C_nH_2n
(b) C_nH_{2n + 2}
(c) C_nH_{2n – 2}
(d) CnH2n – 4

Answer : C

Question. The structures of three hydrocarbons, X, Y and Z are shown below: 


Which of the statements about X, Y and Z are correct?
1. X and Y are isomers.
2. X and Y have the same percentage composition by mass.
3. Y is the isomer of alkane having formula, C₅H₁₂.
4. Z has the same boiling point as n-butane.
(a) 1, 2 and 3
(b) 2 and 4
(c) 1 and 4
(d) 1, 3 and 4

Answer : A

Question. Which covalent molecule contains the structure where the central atom is bonded to four other atoms by covalent bonds? 
1. Diamond
2. Graphite
3. Methane
4. Silicon dioxide
(a) 1 and 2
(b) 2 and 4
(c) 3 and 4
(d) 1, 3 and 4

Answer : D

Question. Three hydrocarbons X, Y and Z are shown below : 
X : CH₃CH₂CH₂CH₂CH₃
Y : CH₃ – C ≡ C – CH₂CH₃
Z : CH₃CH₂ – CH = CH – CH₃
Identify the incorrect statements about these three hydrocarbons.
I. X and Y both differ by a CH2 unit.
II. X and Z have the same boiling point.
III. All have different general formulae.
IV. Y and Z have different molecular masses.
(a) I and II
(b) II and III
(c) I and IV
(d) All the statements are incorrect.

Answer : A

Answer : C

Question. A functional group mainly determines the
(a) Physical properties
(b) Chemical properties
(c) Both
(d) None of these

Answer : B

Question. 100% pure ethanol is called
(a) Rectified spirit
(b) Absolute alcohol
(c) Denatured alcohol
(d) Power alcohol

Answer : B

Question. Carboxylic acid containing one carbon atom is
(a) Formic acid
(b) Acetic acid
(c) Citric acid
(d) Vinegar

Answer : A

Question. The odour of acetic acid resembles that of:
(a) Tomato
(b) Kerosene
(c) Vinegar
(d) Lemon juice

Answer : C

Question. Sodium carbonate solution is added to dilute ethanoic acid) It is observed that :
(a) A gas evolves
(b) A solid settles at the bottom
(c) The mixture becomes warm
(d) The colour of the mixture

Answer : A

Question. 2ml of acetic acid is added to 5ml of water and was shaken up for 1minute, it was noticed that:
(a) The acid formed a separate layer on the top of water
(b) Water formed a separate layer on the top of the acid
(c) A clear and homogeneous solution is formed
(d) A pink and clear solution is formed

Answer : C

Question. On adding NaHCO₃ to acetic acid, a gas is evolved which turns lime water milky due to the formation of:
(a) Calcium Carbonate
(b) Calcium Hydroxide
(c) Calcium bicarbonate
(d) Calcium Acetate

Answer : A

Question. Which among the following contains triple bond:
(a) C₂H₄
(b) C₂H₂
(c) C₃H₄
(d) C₂H₆

Answer : B

Question. The number of covalent bonds in C₅H₁₂ is:
(a) 15
(b) 16
(c) 17
(d) 18

Answer : B

Question. Which amongst the following does not conduct electricity:
(a) CH₃COOH
(b) C₃H₇OH
(c) HCOOH
(d) NaCl(aq)

Answer : B

Question. Methane reacts with one mole of Chlorine in presence of sunlight to give _________.
The reaction is called_______.
(a) Chloromethane, substitution
(b) Dichloromethane, addition
(c) Trichloromethane, elimination
(d) Tetra chloro methane, combustion

Answer : A

Question. Catenation is maximum in:
(a) Carbon
(b) Oxygen
(c) Sulphur
(d) Phosphorous

Answer : A

Question. Ethane and ethene can be distinguished by using:
(a) Bromine water
(b) Chlorine water
(c) I₂
(d) HCl

Answer : A

Question. The number of isomers of C₆H₁₄ are
(a) 4
(b) 5
(c) 6
(d) 7

Answer : C

Question. Which of the following represents cyclohexane:
(a) C₆H₁₄
(b) C₆H₁₂
(c) C₆H₁₀
(d) C₆H₆

Answer : B

Question. The IUPAC name of the following;

(a) Butanal
(b) Butanoic acid
(c) Butanol
(d) Pentane

Answer : B

Question. Which of the following are members of the same homologous series:
(a) CH₄ and C₂H₄
(b) CH₃OH and CH₃Cl
(c) C₂H₅OH and C₃H₇OH
(d) CH₃OCH₃ and C₂H₅OH

Answer : B

Question. The difference in the molecular formula and molecular mass of CH₄ and C₂H₆ is:
(a) CH₃ and 12u
(b) CH₂ and 12u
(c) CH₃ and 14u
(d) CH₂ and 14u

Answer : D

Question. Which of the following statements about diamond and graphite is true?
(a) They have same crystal structure
(b) They have same degree of hardness
(c) They have same electrical conductivity
(d) They have same chemical properties.

Answer : D

Question. Identify the correct statements. 
(i) As the molecular mass increases in any homologous series, a gradation in physical properties is seen.
(ii) The melting and boiling points decrease with increasing molecular mass.
(iii) Other physical properties such as solubility in a particular solvent decreases with increasing molecular mass.
(iv) The chemical properties, which are determined solely by the functional group, remain similar in a homologous series.
(a) (ii) and (iii)
(b) (ii) and (iv)
(c) (i), (iii) and
(iv) (d) All are correct.

Answer : C

Question. The structural formulae of compounds Q and R are shown below : 


Which statement about compounds Q and R is correct?
(a) They belong to the same homologous series.
(b) They have the same percentage composition by mass.
(c) They have the same boiling point.
(d) They have different general formulae.

Answer : B

Question. Graphite is a good conductor of electricity. Diamond is a poor conductor of electricity. Substance X is a moderate conductor of electricity. Substance X has the structure shown below: 

Which statement about substance X is correct?
(i) It is a covalent compound.
(ii) It has a giant molecular structure.
(iii) It has the same structure as graphite.
(iv) It has the same structure as diamond.
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (i), (ii) and (iv)

Answer : C

Question. __________ is widely used as a fuel and is a major component of bio-gas and CNG. It is also one of the simplest compounds formed by carbon. 
(a) Ethane
(b) Propane
(c) Carbon dioxide
(d) Methane

Answer : D

Question. Which of the following compounds has a triple bond? 
(a) C₂H₄
(b) C₃H₄
(c) C₃H₈
(d) C₄H₁₀

Answer : B

Question. Which of the following statements is not correct? 
(a) A common functional group is present in different members of a homologous series.
(b) Two consecutive members of a homologous series differ by a –CH₃ group.
(c) The members of a homologous series can be represented by one general formula.
(d) Different members of a homologous series have similar chemical properties.

Answer : B

Question. The general formula of cycloalkanes is 
(a) C_nH_{2n + 2}
(b) C_nH_{2n – 2}
(c) C_nH_{2n – 1}
(d) C_nH_2n

Answer : D

Question. How many structural isomers are possible for pentane (C₅H₁₂)?
(a) 1
(b) 4
(c) 2
(d) 3

Answer : D

Question. Which of the following is not a characteristic of members of a homologous series? 
(a) They possess varying chemical properties.
(b) Their physical properties vary in regular and predictable manner.
(c) Their formulae fit the general molecular formula.
(d) Adjacent members differ by one carbon and two hydrogen atoms.

Answer : A

Question. Which of the following exists as a simple triatomic molecule? 
(a) Argon
(b) Fluorine
(c) Nitrogen
(d) Ozone

Answer : D

Question. Number of electrons shared between carboncarbon atoms in ethene is 

(a) 2
(b) 4
(c) 6
(d) 8

Answer : B

Question. Chlorine forms a diatomic molecule, Cl₂. The electron dot structure for this molecule is 

Answer : C

Question. Which of the following has shortest carboncarbon bond length? 
(a) C₂H₂
(b) C₂H₄
(c) C₂H₆
(d) C₆H₆

Answer : A

Question. Which of the following statements is correct? 
(a) Most organic compounds are ionic compounds.
(b) Ethane and ethene belong to the same homologous series.
(c) Propene contains three hydrogen atoms per molecule.
(d) Chloroethane contains two carbon atoms per molecule.

Answer : D

Question. In C₆H₁₄ the number of possible isomers is 
(a) 3
(b) 6
(c) 4
(d) 5

Answer : D

Question. The organic compound, R, has the structure shown below: 

Which structure is not an isomer of R?

Answer : D

Question. Which type of bond is present between carbon-carbon atoms in acetylene? 
(a) Single covalent bond
(b) Double covalent bond
(c) Triple covalent bond
(d) Electrovalent bond

Answer : C

Question. Which of the following organic compounds does not have the same chemical properties as methanol? 
(a) C₂H⁶O
(b) C₅H₁₀O
(c) C₄H₁₀O
(d) C₇H₁₆O

Answer : B

Question. Which of the following represent saturated hydrocarbons? 
1. CH(CH₃)₃
2. CH₂CHCH₃
3. CH₃CH(CH₃)CH₂CH₃
4. (CH₃)₂CCHCH₃
(a) 1 and 3
(b) 2 and 4
(c) 1, 2 and 3
(d) 1, 2, 3 and 4

Answer : A

Question. Which of the following molecules has all its atoms joined together by double covalent bonds? 
(a) Methane
(b) Water
(c) Carbon dioxide
(d) Nitrogen trichloride

Answer : C

Question. Which of the following hydrocarbons represents the isomer of butene? 

Answer : B

Question. The table shows the formulae of three organic compounds that belong to the same homologous series. 

What is the general formula of this series?
(a) C_nH_2nO
(b) C_nH_2n+2O
(c) C_nH_2nOH
(d) C_nH_2n+2OH

Answer : B

Question. Which of the following is correct about the structure of diamond? 
(a) Carbon atoms are held together by single covalent bonds.
(b) Electrons move freely through the structure.
(c) Layers of atoms slide easily over each other.
(d) Carbon atoms conduct electricity in the molten state.

Answer : A

Question : Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of
(a) Helium
(b) Neon
(c) Argon
(d) Krypton

Answer :  B

Question : The number of C-H bonds in ethane(C₂H₆) molecule are:
(a) 10
(b) 8
(c) 6
(d) 4

Answer :  C

Question : Ionic compounds have does not show below property.
(a) High melting point
(b) High boiling point
(c) Conduction of electricity in solid state
(d) Conduction of electricity in molten state

Answer :  C

Question : Rigid Three dimensional structure of carbon allotrope forming 4 bond with each carbon.
(a) Fullerene
(b) Diamond
(c) Graphite
(d) Carbon ball

Answer :  B

Question : Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
(a) Addition reaction
(b) Substitution reaction
(c) Displacement reaction
(d) Oxidation reaction

Answer :  A

Question : Which is not correct for isomers of a compound?
(a) They differ in physical properties
(b) They differ in chemical properties
(c) They have same molecular formula
(d) They have same structural formula

Answer :  D

Question : Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of
(a) Helium
(b) Neon
(c) Argon
(d) Krypton

Answer :  B

Question : Hydrophobic end of micelles attack on ______
(a) Water
(b) Oil
(c) Acid
(d) Base

Answer :  B

Question : The first member of alkyne homologous series is
(a) Ethyne
(b) Ethene
(c) Propyne
(d) Methane

Answer :  A

Question : Three carbon chain with ketone functional group would name in following .
(a) Butanol
(b) Butanoate
(c) Propanol
(d) Propanoate

Answer :  D

Question : Which of the given is a noble gas?
(a) Carbon
(b) Argon
(c) Nitrogen
(d) Hydrogen

Answer :  B

Question : Oils On Treating With Hydrogen In The Presence Of Palladium Or Nickel Catalyst Form Fats. This Is An Example Of:
(a) Addition reaction
(b) Substitution reaction
(c) Displacement reaction
(d) Oxidation reaction

Answer :  A

Question : Atomic number of Cl.
(a) 16
(b) 12
(c) 17
(d) 18

Answer :  C

Question : The property of self-linkage among identical atoms to form long chain compounds is known as:
(a) Catenation
(b) Isomerisation
(c) Superposition
(d) Halogenation

Answer :  A

Question : Which of the following is ethanol?
(a) CH₃CHO
(b) CH₃COOH
(c) CH₃CH₂
(d) CH₃COOCH₃

Answer :  C

Question : Subsequent members of homologous series differ by how many atomic mass units?
(a) 14
(b) 16
(c) 24
(d) 28

Answer :  A

Question : The organic compounds having functional group are known as:
(a) Aldehyde
(b) Ketone
(c) Carboxylic acids
(d) Alcohol

Answer :  C

Question : Cooking oils contain _____
(a) Saturated healthy acids
(b) Saturated acids
(c) Unsaturated healthy acids
(d) Unsaturated fatty acids

Answer :  D

Question : Functional group – CHO is present in which of the following?
(a) Carboxylic acid
(b) Alcohol
(c) Aldehyde
(d) Ketone

Answer :  C

Question : Carbon Exists In The Atmosphere In The Form Of:
(a) Only carbon monoxide
(b) Carbon monoxide in traces and carbon dioxide
(c) Only Carbon dioxide
(d) Coal

Answer :  C

Assertion & Reason Bsed MCQs 

(a) Both assertion and reason are true, and reason is correct explanation of the assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation of the assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true.

Question. Assertion : Diamond and graphite do not have the same crystal structure.
Reason : Diamond is crystalline while graphite is amorphous.

Answer : C

Question. Assertion : Ethanol is first member of the alcohol homologous series. 
Reason: A homologous series can be represented by a general formula.

Answer : D

Question. Assertion : Covalent compounds are generally poor conductor of electricity. 
Reason : They consist of molecules and not ions which can transfer charge.

Answer : A

Question. Assertion : Carbon and its compounds can be used as fuels.
Reason : They are highly inflammable and have high calorific value.

Answer : A

Question. Assertion : Carbon possesses property of catenation. 
Reason : Carbon atoms form double as well as triple bonds during catenation.

Answer : B

Question. Assertion : Both aldehydes and ketones contain carbonyl group.
Reason : In aldehydes, the functional group is attached to atleast one hydrogen atom.

Answer : B

Question. Assertion : Graphite is a good conductor of electricity.
Reason : It has one free valence electron.

Answer : A

Question. Assertion : Diamond is not a good conductor of electricity. 
Reason : It has no free electrons.

Answer : A

Question. Assertion : Graphite is soft and slippery to touch.
Reason : Graphite has sheet like layered structure.

Answer : A

Question. Assertion : Two members of a homologous series have similar chemical properties. 
Reason : Propane and butane are members of same homologous series.

Answer : B

Question. Assertion : Olefins have the general formula C_nH_2n+1.
Reason : There is atleast one double bond between two carbon atoms in their molecules.

Answer : D

Question. Assertion : In alkanes, alkenes and alkynes the valency of carbon is always four. 
Reason : All hydrocarbons except alkanes contain double bonds.

Answer : C

Question. Assertion : Saturated hydrocarbons are chemically less reactive. 
Reason : All the valencies of carbon atom are satisfied by single covalent bonds.

Answer : A

Question. Assertion : Diamond is the hardest natural known substance. 
Reason : Diamond is used for cutting marble, granite and glass.

Answer : B

Question. Assertion : The functional group present in alcohols is –OH.
Reason : It is the same group as present in water, hence water and alcohol have similar properties.

Answer : C

a) Formic acid

b) Acetic acid

c) Citric acid

d) Vinegar

Answer : A

 

Question : The odour of acetic acid resembles that of:

a) Tomato

b) Kerosene

c) Vinegar

d) Lemon juice

Answer : C

 

Question : Sodium carbonate solution is added to dilute ethanoic acid) It is observed that :

a) A gas evolves

b) A solid settles at the bottom

c) The mixture becomes warm

d) The colour of the mixture

Answer : A

 

Question : 2ml of acetic acid is added to 5ml of water and was shaken up for 1minute, it was noticed that:

a) The acid formed a separate layer on the top of water

b) Water formed a separate layer on the top of the acid

c) A clear and homogeneous solution is formed

d) A pink and clear solution is formed

Answer : C

 

Question : On adding NaHCO₃ to acetic acid, a gas is evolved which turns lime water milky due to the formation of:

a) Calcium Carbonate

b) Calcium Hydroxide

c) Calcium bicarbonate

d) Calcium Acetate

Answer : A

 

Question : Which among the following contains triple bond:

a) C₂H₄

b) C₂H₂

c) C₃H₄

d) C₂H₆

Answer : B

 

Question : The number of covalent bonds in C₅H₁₂ is:

a) 15
b) 16
c) 17
d) 18

Answer : B

 

Question : Which amongst the following does not conduct electricity:

a) CH₃COOH

b) C₃H₇OH

c) HCOOH

d) NaCl(aq)

Answer : B

 

 

Question : Methane reacts with one mole of Chlorine in presence of sunlight to give _________.

The reaction is called_______.

a) Chloromethane, substitution

b) Dichloromethane, addition

c) Trichloromethane, elimination

d) Tetra chloro methane, combustion

Answer : A

 

 

Question : Catenation is maximum in:

a) Carbon

b) Oxygen

c) Sulphur

d) Phosphorous

Answer : A

 

 

Question : Ethane and ethene can be distinguished by using:

a) Bromine water

b) Chlorine water

c) I₂

d) HCl

Answer : A

 

 

Question : The number of isomers of C₆H₁₄ are

a) 4
b) 5
c) 6
d) 7

Answer : C

 

 

Question : Which of the following represents cyclohexane:

a) C₆H₁₄

b) C₆H₁₂

c) C₆H₁₀

d) C₆H₆

Answer : B

 

 

Question : The IUPAC name of the following;

 

a) Butanal

b) Butanoic acid

c) Butanol

d) Pentane

Answer : C

 

 

Question : Which of the following are members of the same homologous series:

a) CH₄ and C₂H₄

b) CH₃OH and CH₃Cl

c) C₂H₅OH and C₃H₇OH

d) CH₃OCH₃ and C₂H₅OH

Answer : C

 

 

Question : The difference in the molecular formula and molecular mass of CH₄ and C₂H₆ is:

a) CH₃ and 12u

b) CH₂ and 12u

c) CH₃ and 14u

d) CH₂ and 14u

Answer : D

 

 

Question : Which of the following statements about diamond and graphite is true?

a) They have same crystal structure

b) They have same degree of hardness

c) They have same electrical conductivity

d) They have same chemical properties.

Answer : D  

Question : Graphite is good conductor of electricity due to the

a) presence of hexagonal rings 

b) presence of ions

c) presence van der waal forces 

d) presence of free electron
Answer : D

 

Question : Which of the following is a crystalline form of carbon ?

a) Charcoal 

b) Coal 

c) Graphite 

d) Lamp black
Answer : C

 

Question : Which of the following statements regarding graphite is not correct?

a) Graphite is a black and soft crystalline substance

b) Graphite is manufactured by heating coke at 3000^oC.

c) Graphite is a bad conductor of heat and electricity.

d) Graphite possesses a metallic lustre and soapy touch.
Answer : C

 

Question : Organic compounds will always contains

a) carbon 

b) hydrogen

c) nitrogen 

d) sulphur

Answer : A

 

Question : Organic compounds are generally

a) covalent in nature 

b) ionic in nature

c) insoluble in organic solvents 

d) soluble in water

Answer : A

 

Question : The isomers always possess similar

a) chemical properties 

b) molecular formula

c) physical properties 

d) structural formula

Answer : B

 

Question : No of protons, electrons and neutrons respectively in carbon atom is

a) 6,6,8 

b) 6,6,6 

c) 8,6,8 

d) 6,7,8

Answer : B

 

Question : A compound with the molecular formula C2H2 must contain

a) all single bonds 

b) one double bond

c) one triple bond 

d) none of the above

Answer : B

 

Question : The general formula of alkane series is

a) C_n H_2n–2 

b) C_n H_2n 

c) C_n H_2n+2 

d) C_n H_2n+4

Answer : C

 

Question : The next higher homologue of propane is

a) C₂H₆ 

b) C₃H₄ 

c) C₄H₁₀ 

d) C₅H₁₂ 

Answer : C

 

 

Question : The correct IUPAC name of the compound

 

a) 4-ethylpent-1-ene 

b) 2-ethylpent-4-ene 

c) 4-methylhex-1-ene 

d) 3-methylhex-1-ene

Answer : D

 

Question : IUPAC name of the compound given below is

a) 2-methyl-3-ethyl-1-pentene 

b) 3-ethyl-4-methyl-4-pentene

c) 3-ethyl-2-methyl-1-pentene 

d) 3-methyl-2-ethyl-1-pentene

Answer : C

 

Question : Which of the following name is wrong for CH₂=CHCH₂Cl ?

a) Chloro propene 

b) 1-Chloroprop-3-ene

c) 3-Chloroprop-1-ene 

d) 3-Chloropropylene

Answer : B

 

Question : IUPAC name of the compound given below is

a) 6, 6-dibromoheptan-2-ol 

b) 2, 2-dibromoheptan-6-ol

c) 6, 6-dibromoheptan-2-al 

d) None of these

Answer : A

 

Question : Which of the following represents neopentyl alcohol ?

a) CH₃CH(CH₃)CH₂CH₂OH 

b) (CH₃)₃CCH₂OH

c) CH₃CH₂CH₂CH₂OH 

d) CH₃CH₂CH(OH)CH₂

Answer : B

 

Question : The IUPAC name of acetyl acetone is :

a) 2,5–pentanedione 

b) 2,4–pentenedione

c) 2,4–hexanedione 

d) 2,4–pentanedione

Answer : B

 

Question : IUPAC name of the compound is :

a) 4, 4-di(formylmethyl) butanal 

b) 2-(formylmethyl) butane-1, 4-dicarbaldehyde

c) hexane-3-acetaldial 

d) 3-(formylmethyl) hexanedial

Answer : D

 

Question : The IUPAC name of is :-

a) 1-Hydroxy-4-methylpentanoic acid 

b) 1-Methyl-3-hydroxypentanoic acid

c) 4-Hydroxy-2-methylpentanoic acid 

d) 4-Carboxypentanol-2

Answer : C

 

Question : The correct IUPAC name of the compound is :

a) 4-Bromo-1-chloro-2-fluoroiodomethylbutene

b) 4-Bromo-2-chloromethyl-1-fluoro-1-iodobut-1-ene

c) 2-(2-Bromoethyl)-3-chloro-1-fluoro-1-iodoprop-1-ene

d) 1-Bromo-3-chloromethyl-4-fluoro-4-iodobut-1-ene

Answer : A

 

Question : The IUPAC name of

a) propanal 

b) propanol

c) propanoic aldehyde 

d) 2-methylethanal

Answer : A

 

Question : Which of the following pairs is an example of chain isomer ?

a) CH₃ – CH₂ – OH and CH₃OCH₃

b) CH₃ – CH₂ – CHO and CH₃ – COCH₃

c) CH₃ – CH₂ – CH₂ – CH₂ – CH₃ and CH₃–(CH₃)CH–CH₂–CH₃

d) All of the above

Answer : D

 

Question : The oxidation of CH₃CH₂CHO produces

a) CH₃COOH 

b) CH₃CH₂COOH

c) CH₃COCH₃  

Answer : B

 

Question : Identify the 'product' in the reaction CH₃COOH + C₂H₅OH → conce.H₂SO₄  Product + H₂O

a) alcohol 

b) aldehyde 

c) ketone 

d) ester

Answer : D

 

Question : Identify the 'product' in the reaction CH₃COOH → LiAIH₄ 'product' + H₂O

a) aldehyde 

b) alcohol 

c) ketone 

d) acid

Answer : A

 

Question : The 'product' in the reaction CH₃CH₂OH 350ºC → Al₂O₃ 'product' + H₂O is

a) alkane 

b) alkene 

c) alkyne 

d) none of these

Answer : B

 

Question : The 'product' of the reaction CH₂ = CH₂ [O]→KMnO₄ 'product' is

a) CH₃COOH 

b) HOCH₂CH₂OH

c) COOH

     ↓

     COOH

d) none of these

Answer : B

 

Question : Total number of non-cyclic structural isomers of C₄H₁₀ are

a) 5 

b) 7 

c) 2 

d) 4

Answer : C

 

Question : Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of

a) Addition 

b) Displacement

c) Substitution 

d) Oxidation

Answer : A

 

Question : Oxidation of alcohol in presence of alk.KMnO₄ results in formation of

a) aldehyde

b) ester 

c) acid 

d) ketone

Answer : C

 

Question : C₂H₅OH in presence of conc) H₂SO₄ convert into ethene. What role does sulphuric acid plays here ?

a) reducing agent 

b) oxidizing agent

c) dehydrating agent 

d) both B and C

Answer : C