Amines(12th Grade > Chemistry ) Questions and answers for exam Preparation

12th Grade > Chemistry

AMINES MCQs

Total Questions : 30 | Page 1 of 3 pages

Question 1. The colour of 'C' in the following is

Blue
Yellow
Orange
Green

Discuss Question

Answer: Option C. -> Orange
:
C
A is diazoniumchloride ; B is phenol & C is azo dye

Question 2. Incorrect order of basic strength of amines in aqueous state

(CH3)2NH > CH3NH2> (CH3)3N
(C2H5)2NH > (C2H5)3N > C2H5NH2
C2H5NH2> NH3> C6H5NH2
(C6H5)2NH > C6H5NH2> C2H5NH2

Discuss Question

Answer: Option D. -> (C6H5)2NH > C6H5NH2> C2H5NH2
:
D
Aromatic amine are less basic than aliphatic

Question 3. Assertion (A): Both aromatic and aliphatic primary amines produce stable diazonium salts on diazotization
Reason (R): Aromatic diazonium salt exhibit resonance

A and R are true and R is the correct explanation of A
A and R are true and R is not the correct explanation of A
A is true, R is false
A is false, R is true

Discuss Question

Answer: Option D. -> A is false, R is true
:
D
Aliphatic amine diazonium salt is unstable

Question 4. A positive carbyl amine test is given by
1. N, N - Dimethyl aniline
2. 2,4 - Dimethyl aniline
3. N - Methyl - o - methyl aniline
4. p - Methyl benzyl amine

2, 4
1, 2, 3
1, 2 , 4
1, 4

Discuss Question

Answer: Option A. -> 2, 4
:
A
2 & 4 are 1⁰amine; 1 is 3⁰amine;3 is 2⁰amine & only 1⁰amine gives a positivecarbyl amine test

Question 5.

Discuss Question

Answer: Option A. -> 1,6
:
A
Y is CH₃ CHO

Question 6.

I, II only
II, III only
III, IV only
II, III. IV only

Discuss Question

Answer: Option B. -> II, III only
:
B
Basic nature decreases by steric effect & phenyl groups as it has - R effect

Question 7. The correct increasing order of boiling points of the following compound is
A. Isopentane B. n - butyl alcohol
C. n - butyl amine D. Diethyl amine

A, D, C, B
B, C, D, A
B, C, D, A
D, A, C, B

Discuss Question

Answer: Option A. -> A, D, C, B
:
A
Alcohol has the highest followed by 1⁰ amine, then 2⁰amine

Question 8. Which of the following statement is incorrect

Aniline reacts with bromine at room temperature to give a white precipitate of 2,4,6 - tribromo aniline
Acetanilide is less reactive towards electrophilic aromatic substitution reaction than aniline
Aniline does not undergo Friedel - crafts reaction, due to salt formation with catalyst aluminium chloride
Aniline reacts with Conc H2SO4 gives anilinium hydrogen sulphate which on heating with sulphuric acid at 453 - 473 K gives o - amino benzene sulphonic acid only

Discuss Question

Answer: Option D. -> Aniline reacts with Conc H2SO4 gives anilinium hydrogen sulphate which on heating with sulphuric acid at 453 - 473 K gives o - amino benzene sulphonic acid only
:
D
Sulphanilic acid is formed which can present as Zwittter ion

Question 9.