JEE Chemistry Organic Chemistry Some Basic Principles and Techniques MCQs Set C

Question:  In Kjeldahl’s method for the estimation of N₂ , potassium sulphate and copper sulphate are used. On the basis of their functions which of the following statement(s) is/are correct?

(i) Potassium sulphate raises the bpt. and ensures complete reaction.
(ii) Copper sulphate acts as catalyst.
(iii) Potassium sulphate acts as catalyst and copper sulphate raises the bpt.

• a) (i) and (ii) are correct
• b) None is correct
• c) Only (iii) is correct
• d) Only (ii) is correct

Answer: (i) and (ii) are correct

Question: In the estimation of carbon and hydrogen by combustion method which of the following is/are correct ?

(i) A spiral of copper is introduced at the right extreme of combustion tube if the organic compound contains nitrogen.
(ii) A spiral of silver is introduced if the organic compound contains halogens.
(iii) The copper oxide in the combustion tube is replaced by lead chromate if the organic compound contains sulphur.

• a) All are correct
• b) (i) and (iii) are correct
• c) (i) and (ii) are correct
• d) (ii) and (iii) are correct

Answer: All are correct

Question:

• a) A – (s), B – (p), C – (q), D – (r)
• b) A – (p), B – (r), C – (s), D – (q)
• c) A – (r), B – (p), C – (q), D – (s)
• d) A – (r), B – (p), C – (s), D – (q)

Answer: A – (s), B – (p), C – (q), D – (r)

Question:  Match Column-I (organic compound) with Column-II (common name of the compound) and choose the correct option.

• a) A – (q), B – (s), C – (p), D – (r)
• b) A – (q), B – (s), C – (r), D – (p)
• c) A – (r), B – (p), C – (s), D – (q)
• d) A – (r), B – (s), C – (p), D – (q)

Answer: A – (q), B – (s), C – (p), D – (r)

Question:

• a) A – (s), B – (r), C – (q), D – (p)
• b) A – (s), B – (q), C – (p), D – (r)
• c) A – (p), B – (q), C – (r), D – (s)
• d) A – (r), B – (s), C – (q), D – (p)

Answer: A – (s), B – (r), C – (q), D – (p)

Question:

• a) A – (q), B – (p), C – (p), D – (r)
• b) A – (q), B – (p), C – (q), D – (r)
• c) A – (p), B – (s), C – (q), D – (r)
• d) A – (q), B – (p), C – (s), D – (r)

Answer: A – (q), B – (p), C – (p), D – (r)

Question:

• a) A – (r), B – (q), C – (p), D –(s)
• b) A – (s), B – (p), C – (r), D –(q)
• c) A – (s), B – (p), C – (q), D –(r)
• d) A – (s), B – (q), C – (p), D –(r)

Answer: A – (r), B – (q), C – (p), D –(s)

Question:

• a) A – (q), B – (p), C – (r), D – (s)
• b) A – (p), B – (q), C – (s), D – (r)
• c) A – (q), B – (s), C – (p), D – (r)
• d) A – (q), B – (p), C – (s), D – (r)

Answer: A – (q), B – (p), C – (r), D – (s)

Question:

• a) A – (q), B – (s), C – (p), D – (r)
• b) A – (q), B – (s), C – (r), D – (p)
• c) A – (s), B – (q), C – (p), D – (r)
• d) A – (s), B – (q), C – (r), D – (p)

Answer: A – (q), B – (s), C – (p), D – (r)

Question:

• a) A – (p), B – (r), C – (q), D – (s)
• b) A – (q), B – (r), C – (s), D – (p)
• c) A – (q), B – (s), C – (p), D – (r)
• d) A – (q), B – (p), C – (s), D – (r)

Answer: A – (p), B – (r), C – (q), D – (s)

Question:

• a) A – (p), B – (p), C – (q)
• b) A – (p), B – (q), C – (r)
• c) A – (r), B – (p), C – (q)
• d) A – (p), B – (p), C – (r)

Answer: A – (p), B – (p), C – (q)

Question:

• a) A – (q), B – (s), C – (p), D – (r)
• b) A – (s), B – (q), C – (r), D – (p)
• c) A – (q), B – (r), C – (p), D – (s)
• d) A – (q), B – (s), C – (r), D – (p)

Answer: A – (q), B – (s), C – (p), D – (r)

Question:

• a) A – (q), B – (r), C – (s), D – (p)
• b) A – (r), B – (q), C – (s), D – (p)
• c) A – (r), B – (q), C – (p), D – (s)
• d) A – (q), B – (r), C – (p), D – (s)

Answer:  A – (q), B – (r), C – (s), D – (p)

Question:

• a) A – (s), B – (r), C – (p), D – (q)
• b) A – (r), B – (s), C – (q), D – (p)
• c) A – (s), B – (p), C – (q), D – (r)
• d) A – (p), B – (r), C – (q), D – (s)

Answer: A – (s), B – (r), C – (p), D – (q)

Question:

Assertion : A primary suffix indicates the type of linkage in the carbon atom.
Reason : CN is a Primary suffix

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

Assertion : The general formula for a dihydric alcohol is C_nH_2n(OH)₂
Reason : Ethylene glycol is a dihydric alcohol.

• a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Question:

• a) Assertion is incorrect, reason is correct
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct

Question:

• a) Assertion is incorrect, reason is correct
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct

Question:

Assertion : Chain isomerism is observed in compounds containining four or more than four carbon atoms
Reason : Only alkanes show chain isomerism.

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer:  Assertion is correct, reason is incorrect

Question:

Assertion : But-1-ene and 2-methylprop-1-ene are position isomers.
Reason : Position isomers have same molecular formula but differ in position of functional group or C = C.

• a) Assertion is incorrect, reason is correct
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct

Question:

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

More Questions..........................

Question:

Assertion : Aniline is better nucleophile than anilium ion.
Reason : Anilium ion have +ve charge

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) None of these

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

Assertion : Different number of electron pairs are present in resonance structures.
Reason : Resonance structures differ in the location of electrons around the constituent atoms.

• a) Assertion is incorrect, reason is correct
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct

Question:

Assertion : Energy of resonance hybrid is equal to the average of energies of all canonical forms.
Reason : Resonance hybrid cannot be presented by a single structure.

• a) Assertion is incorrect, reason is correct
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct

Question:

Assertion : Simple distillation can help in separating a mixture of propan-1-ol (boiling point 97°C) and propanone (boiling point 56°C).
Reason : Liquids with a difference of more thatn 20°C in their boiling points can be separated by simple distillation

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

Assertion : Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography.
Reason : The coloured components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

Assertion : Sulphur present in an organic compound can be estimated quantitatively by Carius method.
Reason : Sulphur is separated easily from other atoms in the molecule and gets precipitated as light yellow solid

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

• a) N – phenyl ethanamide
• b) N – phenyl ethanone
• c) N – phenyl methanamide
• d) None of these

Answer: N – phenyl ethanamide

Question:

• a) Pent – 2 –ene – 2, 3 – diol
• b) 2 – methylbut – 2 – ene – 2, 3 – diol
• c) Hex – 2 – ene – 2, 3 – diol
• d) But – 2 ene – 2, 3– diol

Answer: Pent – 2 –ene – 2, 3 – diol

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a) D
• b) C
• c) B
• d) A

Answer: D

Question:

• a) 1 : 4
• b) 1 : 2
• c) 1 : 6
• d) 3 : 1

Answer:  1 : 4

Question:

• a) (ii)
• b) (i) and (iv)
• c) (iii) and (iv)
• d) (ii) and (iii)

Answer: (ii)

Question: Which of the following represents the given mode of hybridisation sp²–sp² – sp – sp from left to right?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question:

• a) 3, 3-dimethyl - 1- cyclohexanol
• b) 1, 1-dimethyl-3-hydroxy cyclohexane
• c) 3, 3-dimethyl-1-hydroxy cyclohexane
• d) 1, 1-dimethyl-3-cyclohexanol

Answer: 3, 3-dimethyl - 1- cyclohexanol

Question:

• a) 2 - hydroxy propane -1, 2, 3 - tricarboxylic acid
• b) 3 - hydroxy - 3 - carboxy - 1, 5 - pentanedioic acid
• c) 3 - carboxy - 3 hydroxy - 1 , 5 - pentanedioic acid
• d) 1, 2, 3 - tricarboxy - 2, 1 - propane

Answer: 2 - hydroxy propane -1, 2, 3 - tricarboxylic acid

Question: The number of possible open chain (acyclic) isomeric compounds for molecular formula C₅H₁₀ would be

• a) 6
• b) 8
• c) 7
• d) 5

Answer:  6

Question: Which of the following compounds will show metamerism?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: The compound C₄H1₀O can show

• a) All of these
• b) functional isomerism
• c) metamerism
• d) position isomerism

Answer: All of these

Question: Which pair of isomerism is not possible together?

• a) Metamerism and functional
• b) Metamerism and chain
• c) Geometrical and optical
• d) Ring-chain and functional

Answer: Metamerism and functional

Question:  Which of the following represents the correct order of stability of the given carbocations ?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The most stable carbanion among the following is

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: Which one of the following is a free-radical substitution reaction?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a) Cl
• b) OC₂H₅
• c) NH₂
• d) OCOCH₃

Answer: Cl

Question: For (i) I^–, (ii) Cl^–, (iii) Br^–, the increasing order of nucleophilicity would be

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: Which of the following is least reactive in a nucleophilic substitution reaction

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a) (iii) and (iv)
• b) (ii) and (iii)
• c) (ii) only
• d) (ii) and (iv)

Answer: (iii) and (iv)

Question: In Lassaigne’s test, the organic compound is fused with a piece of sodium metal in order to

• a) convert the covalent compound into a mixture of ionic compounds
• b) increase the reactivity of the compound
• c) decrease the melting point of the compound
• d) increase the ionisation of the compound

Answer: convert the covalent compound into a mixture of ionic compounds

Question: The most suitable method for separtion of a 1 : 1 mixture of ortho and para nitrophenols is

• a) Steam distillation
• b) Chromatography
• c) Sublimation
• d) Crystallization

Answer:  Steam distillation

Question: The molecular mass of an organic compound which contains only one nitrogen atom can be

• a) 73
• b) 146
• c) 152
• d) 76

Answer:  73

Question: Butanone is a four-carbon compound with the functional group –

• a) ketone
• b) carboxylic acid
• c) aldehyde.
• d) alcohol.

Answer: ketone

Question: The functional group present in CH₃COOC₂H₅ is

• a) ester
• b) ketonic
• c) aldehydic
• d) carboxylic

Answer: ester

Question: Which of the following compounds contains 1°, 2°, 3° as well as 4° carbon atoms ?

• a) 2,2,3-trimethyl pentane
• b) 2-methyl pentane
• c) Neopentane
• d) 2,3-dimethyl butane

Answer:  2,2,3-trimethyl pentane

Question: The number of secondary hydrogens in 2, 2-dimethylbutane is

• a) 2
• b) 6
• c) 8
• d) 4

Answer: 2

Question: The compound which has one isopropyl group is

• a) 2- Methypentane
• b) 2, 2, 3- Trimethylpentane
• c) 2, 2 - Dimethylpentane
• d) 2, 2, 3, 3 - Tetramethylpentane

Answer: 2- Methypentane

Question: Which of the following statements is false for isopentane ?

• a) It has a carbon which is not bonded to hydrogen
• b) It has one CH group
• c) It has one CH₂ group
• d) It has three CH₃ groups

Answer: It has a carbon which is not bonded to hydrogen

Question: The number of primary, secondary and tertiary carbons in 3, 4-dimethylheptane are respectively

• a) 4, 3 and 2
• b) 4, 2 and 3
• c) 2, 3 and 4
• d) 3, 4 and 2

Answer: 4, 3 and 2

Question: The number of primary, secondary, tertiary and quaternary carbons in neopentane are respectively

• a) 4, 0, 0 and 1
• b) 4, 3, 2 and 1
• c) 5, 0, 0 and 1
• d) 4, 0, 1 and 1

Answer: 4, 0, 0 and 1

Question: What is the IUPAC name of t-butyl alcohol

• a) 2–Methyl-propan–2-ol
• b) Propanol-2
• c) Butanol–2
• d) Butanol–1

Answer: 2–Methyl-propan–2-ol

Question: The IUPAC name of CH₃COCH (CH₃)₂ is -

• a) 3-methyl-2-butanone
• b) 4-methylisopropyl ketone
• c) 2-methyl-3-butanone
• d) isopropyl methyl ketone

Answer: 3-methyl-2-butanone

Question:

• a) 2–ethyl–3–methylpentanal
• b) 2, 3–diethylbutanal
• c) 2–sec butylbutanal
• d) 3–methyl–2–ethylpentanal

Answer: 2–ethyl–3–methylpentanal

Question: Which of the following statements is false for isopentane

• a) It has a carbon which is not bonded to hydrogen
• b) It has one CH group
• c) It has one CH₂ group
• d) It has three CH₃ groups

Answer:  It has a carbon which is not bonded to hydrogen

Question: The IUPAC name of the compound CH₃OCH₂CH₂CH₂OCH₂CH₃ is

• a) 3-ethoxy-1-methoxypropane
• b) 1-ethoxy-3-methoxypropane
• c) 2, 5-dioxyhexane
• d) ethoxypropane oxymethane

Answer: 3-ethoxy-1-methoxypropane

Question: Which of the following compounds has wrong IUPAC name?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question:

• a) 3-bromo-1-chlorocyclohexene
• b) 1-bromo-3-chlorocyclohexene
• c) 2-bromo-6-chlorocyclohex-1-ene
• d) 6-bromo-2-chlorocyclohexene

Answer: 3-bromo-1-chlorocyclohexene

Question:

• a) 3-methyl pentan-3-ol
• b) diethylethanol
• c) 1-ethyl-1-methylpropan-1-ol
• d) 2-ethylbutan-2-ol

Answer: 3-methyl pentan-3-ol

Question:

• a) 5–chlorohex–2–ene
• b) 2–chlorohex–5–ene
• c) 1–chloro–1–methylpent–3–ene
• d) 5–chloro–5–methylpent–2–ene

Answer:  5–chlorohex–2–ene

Question:

• a) 2 - phenylbutane
• b) 3 - phenylbutane
• c) 2 - cyclohexylbutane
• d) 3 - cyclohexylbutane

Answer: 2 - phenylbutane

Question:

• a) 5-methyl-3-hexanamine
• b) 2-methyl-4-hexanamine
• c) 2-methyl-4-amino hexane
• d) 5-methyl-3-amino hexane

Answer: 5-methyl-3-hexanamine

Question:  Which one of the following is ethyl-4-(dimethyl amino) butanoate ?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer: