CBSE Class 10 Science Carbon and its compound Sure Shot Questions Set 03

Question. Which of the following have a triple bond?
(a) \( C_2H_4 \)
(b) \( C_3H_4 \)
(c) \( C_3H_8 \)
(d) \( C_3H_9 \)
Answer: (b) \( C_3H_4 \)

Question. How many unshared pairs of electrons are present in water molecule?
(a) One
(b) Zero
(c) Two
(d) Three
Answer: (c) Two

Question. Number of electrons shared between carbon-carbon atoms in ethene is
(a) 2
(b) 4
(c) 6
(d) 8
Answer: (b) 4

Question. Which of the following does not contain double bond?
(a) \( CO_2 \)
(b) \( C_2H_4 \)
(c) \( HCl \)
(d) \( O_2 \)
Answer: (c) \( HCl \)

Question. Nitrogen molecule involves formation of
(a) Single covalent bond
(b) Double covalent bond
(c) Triple covalent bond
(d) Ionic bond
Answer: (c) Triple covalent bond

Question. Oxygen molecule involves formation of
(a) Single covalent bond
(b) Double covalent bond
(c) Triple covalent bond
(d) Ionic bond
Answer: (b) Double covalent bond

Question. A phenomenon by which an element occurs in different physical modification in same physical state is called
(a) Isomerism
(b) Allotropy
(c) Amorphous
(d) Crystalline
Answer: (b) Allotropy

Question. Which of the following is not an allotropic form of carbon?
(a) Fullerene
(b) Fluorine
(c) Diamond
(d) Graphite
Answer: (b) Fluorine

Question. Number of free electron(s) in each carbon atom in graphite is/are
(a) Two
(b) Four
(c) One
(d) Three
Answer: (c) One

Question. In fullerene carbon atoms are arranged in mixed
(a) tetragons and pentagons
(b) pentagons and hexagons
(c) pentagons and heptagons
(d) All are correct
Answer: (b) pentagons and hexagons

Question. Two adjacent layers in graphite are bonded by comparatively
(a) strong forces
(b) weak forces
(c) no forces
(d) few strong and few weak forces
Answer: (b) weak forces

Question. Diamond is not a good conductor of electricity because
(a) it is very hard
(b) its structure is very compact
(c) it is not water soluble
(d) it has no free electrons
Answer: (d) it has no free electrons

Question. Which of the following is not a crystalline form of carbon?
(a) Diamond
(b) Graphite
(c) Fullerene
(d) Coke
Answer: (d) Coke

Question. In order to form branching, an organic compound must have a minimum number of
(a) four carbon atoms
(b) three carbon atoms
(c) five carbon atoms
(d) six carbon atoms
Answer: (a) four carbon atoms

Question. The number of isomers of pentane is
(a) 2
(b) 3
(c) 4
(d) 5
Answer: (b) 3

Question. Which of the following represents the correct increasing order of unsaturation?
(a) Alkanes, alkenes, alkynes
(b) Alkanes, alkynes, alkenes
(c) Alkenes, alkynes, alkanes
(d) Alkynes, alkanes, alkenes
Answer: (a) Alkanes, alkenes, alkynes

Question. Among the following the one having longest chain is
(a) Neopentane
(b) Isopentane
(c) 2-Methylpentane
(d) 2,2-Dimethylbutane
Answer: (c) 2-Methylpentane

Question. In \( C_6H_{14} \) the number of possible isomers is
(a) 3
(b) 6
(c) 4
(d) 5
Answer: (d) 5

Question. Which is not a property of graphite?
(a) It melts at 800°C
(b) It is a smooth, crystalline form of carbon
(c) It is a good conductor of electricity
(d) It forms a black sign on the paper
Answer: (a) It melts at 800°C

Question. Which of the following is purest form of carbon?
(a) Diamond
(b) Coal
(c) Wood
(d) Paper
Answer: (a) Diamond

Question. Which of the following is not a saturated hydrocarbon?
(a) Cyclohexane
(b) Benzene
(c) Butane
(d) Isobutane
Answer: (b) Benzene

Question. Which of the following is a pair of saturated hydrocarbon?
(a) Butane and isobutane
(b) Cyclohexane and hexene
(c) Propanal and propanone
(d) All of the options
Answer: (a) Butane and isobutane

Question. A double bond between two carbon atoms is formed by
(a) transfer of two electrons from one carbon to the other
(b) transfer of one electron from one carbon to the other
(c) sharing of two electrons
(d) sharing of two pairs of electrons
Answer: (d) sharing of two pairs of electrons

Question. Which of the following is an isomeric pair?
(a) Ethane and propane
(b) Ethane and ethene
(c) Propane and butane
(d) Butane and 2-methyl propane
Answer: (d) Butane and 2-methyl propane

Question. Pentane has the molecular formula \( C_5H_{12} \). It has
(a) 5 covalent bonds
(b) 12 covalent bonds
(c) 16 covalent bonds
(d) 17 covalent bonds
Answer: (c) 16 covalent bonds

Question. Which of the following gases is called 'Marsh gas'?
(a) \( H_2 \)
(b) \( CH_4 \)
(c) \( C_2H_4 \)
(d) \( C_2H_2 \)
Answer: (b) \( CH_4 \)

Question. Organic compounds will always contain
(a) carbon
(b) hydrogen
(c) nitrogen
(d) sulphur
Answer: (a) carbon

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 –\( CH_3 \) 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) Two consecutive members of a homologous series differ by a –\( CH_3 \) group.

Question. The difference in molecular weight of two consecutive members of a homologous series is
(a) 15
(b) 14
(c) 8
(d) 9
Answer: (b) 14

Question. Which of the following belong to the same homologous series?
(a) Ethane, ethene, ethyne
(b) Propanol, propanone, propanal
(c) Methanol, ethanol, propanol
(d) Ethane, ethanol, ethanoic acid
Answer: (c) Methanol, ethanol, propanol

Question. Unsaturation in the organic compound can be tested by the help of
(a) Baeyer's test
(b) Fehling's test
(c) Chlorination reaction
(d) Dehydration reaction
Answer: (a) Baeyer's test

Question. The functional group present in butanone is
(a) Carboxy
(b) Ketonic
(c) Aldehydic
(d) Alcoholic
Answer: (b) Ketonic

Question. The IUPAC name of \( CH_3CHO \) is
(a) Acetaldehyde
(b) Methanal
(c) Ethanal
(d) Formaldehyde
Answer: (c) Ethanal

Question. The IUPAC name of \( CH_3 – CH_2 – CH(CH_3) – C(CH_3)_2 – CH_3 \) is
(a) 2,2,3-Trimethylpentane
(b) 3,4,4-Trimethylpentane
(c) 2-Ethyl-3,3-dimethylbutane
(d) 2,3-Dimethylhexane
Answer: (a) 2,2,3-Trimethylpentane

Question. The IUPAC name of the compound \( CH_2 = C(CH_3)_2 \) is
(a) 1,1-Dimethylprop-2-ene
(b) 2-Methylprop-1-ene
(c) 2-Ethyl-3,3-dimethylbutane
(d) 2,3-Dimethylhexane
Answer: (b) 2-Methylprop-1-ene

Question. The second member of homologous series of alkenes is
(a) Ethene
(b) Propene
(c) Butene
(d) Ethyne
Answer: (b) Propene

Question. Compound \( CH_3CH_2CH(CH_3)CH_2 – CO – Cl \) has the IUPAC name
(a) 3-Methylpentanoyl chloride
(b) 1-Chloroformyl-2-methyl butane
(c) 3-Methylchloridebutane
(d) 3-Methylchloropentanone
Answer: (a) 3-Methylpentanoyl chloride

Question. Methane, ethane and propane are said to form a homologous series because all are
(a) hydrocarbons
(b) saturated hydrocarbons
(c) aliphatic hydrocarbons
(d) differ from each other by –\( CH_2 \) group
Answer: (d) differ from each other by –\( CH_2 \) group

Question. The reaction \( CH_4 + Cl_2 \xrightarrow[light]{h\nu} CH_3Cl + HCl \) is an example of
(a) addition reaction
(b) substitution reaction
(c) elimination reaction
(d) oxidation reaction
Answer: (b) substitution reaction

Question. The final product obtained when methane reacts with chlorine in presence of sunlight is
(a) \( C_2Cl_6 \)
(b) \( CCl_4 \)
(c) \( CHCl_3 \)
(d) \( CH_2Cl_2 \)
Answer: (b) \( CCl_4 \)