First slide

Chemical properties of Amines

Question

How many of the following give foul smell when heated with ${CHCl}_{3} + KOH (alc)$
A) Isopropylamine B) Tert-butylamine C) Secondary butyalamine D) Methylamine E) Aniline

Moderate

A

2
B

1
C

5
D

3

Solution

$R - {NH}_{2} + {CHCl}_{3} + 3 KOH (alc) \overset{△}{\to} R - NC + 3 KCl + 3 H_{2} O 1^{o} alkyl amine foul smelling isocyanide$
$Ar - {NH}_{2} + {CHCl}_{3} + 3 KOH (alc) \overset{△}{\to} Ar - NC + 3 KCl + 3 H 2 O Primary foul smelling Arylamine isocyanide$
$This is a test to identify a 1^{o} amine, (alkyl, aryl, aryl alkyl)$
$(A) {({CH}_{3})}_{2} {CHNH}_{2} - 1^{o} amine (B) {({CH}_{3})}_{3} {CNH}_{2} - 1^{o} amine (C) {CH}_{3} CH ({NH}_{2}) {CH}_{2} {CH}_{3} - 1^{o} amine (D) {CH}_{3} {NH}_{2} - 1^{o} amine (E) C_{6} H_{5} {NH}_{2} - 1^{o} amine$

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