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Question : 34
Total: 35
(a) (I) Give reasons:
(i) Aniline on nitration gives good amount of m-nitroaniline, though -N H 2 o ∕ p
(ii)( C H 3 ) 2 N H ( C H 3 ) 3 N
(iii) Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.
(II) Write the reaction involved in the following:
(i) Carbyl amine test
(ii) Gabriel phthalimide synthesis
OR
(b) (I) Write the structures of A, B and C in the following reactions:
(III)Arrange the following in increasing order of their boiling point:C 2 H 5 O H , C 2 H 5 N H 2 , ( C 2 H 5 ) 3 N
(i) Aniline on nitration gives good amount of m-nitroaniline, though -
(ii)
(iii) Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.
(II) Write the reaction involved in the following:
(i) Carbyl amine test
(ii) Gabriel phthalimide synthesis
OR
(b) (I) Write the structures of A, B and C in the following reactions:
(II) Why aniline does not undergo Friedal-Crafts reaction?
(III)Arrange the following in increasing order of their boiling point:
Solution: 👈: Video Solution
(a) (I) (i) Nitration is carried out in an acidic medium. In a strongly acidic medium, aniline is protonated to give anilinium ion which is metadirecting. Therefore, aniline on nitration gives a substantial amount of m-nitroaniline.
(ii)( C H 3 ) 2 N H ( C H 3 ) 3 N
(iii) Ammonolysis of alkyl halides leads to the formation of a mixture of primary, secondary, tertiary amines and quaternary salts which is very difficult to separate and obtain pure amine.
(II) (i) Carbyl Amine Test
+ 3 K O H →
(b) (I) (i)C 6 H 5 N 2 C l
( C 6 H 5 C O O N H 4 )
A l C l 3
(III) Increasing order of boiling points:
( C H 3 ) 3 N < C 2 H 5 N H 2 < C 2 H 5 O H
(ii)
(iii) Ammonolysis of alkyl halides leads to the formation of a mixture of primary, secondary, tertiary amines and quaternary salts which is very difficult to separate and obtain pure amine.
(II) (i) Carbyl Amine Test
OR
(b) (I) (i)
(II) It is due to the fact that
(III) Increasing order of boiling points:
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