Answer:
Carbylamines
reaction Primary amines on heating with chloroform and alcoholic KOH give unpleasant
smell of carbylamines (RNC). This reaction is called carbylamines reaction.
Carbylamines
is also called isocyanides 2° and 3° amines do not give this reaction hence can
be distinguished from 1° amine by this reaction. [1]
(ii)
Coupling reaction Benzene diazonium chloride reacts with phenol (alkaline)
to form
p-hydroxy
azo benzene. Hydroxy group is at p-position and this type of reactions is
called coupling reaction.
This is used
to identify aromatic 1 ° amines and takes place at very low temperature (273
K).
It is a case
of electrophonic substitution in benzene nucleus.
[1]
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