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Question

Which of the following amine does not respond to carbylamine reaction?
  1. CH3NH2
  2. Ethylamine
  3. Phenylamine
  4. (CH3)2NH

A
(CH3)2NH
B
CH3NH2
C
Ethylamine
D
Phenylamine
Solution
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Dimethylamine, a secondary amine does not respond to carbylamine reaction.
Carbylamine reaction can be used to identify primary amino group in a given organic compound.
When primary amines are treated with chloroform and alcoholic KOH, they give isocyanides (carbylamines) having very unpleasant smell which can be easily detected.
RNH2+CHCl3+3KOHRNC+3KCl+3H2O

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