Question

Write about carbylamine reaction.

Answer 1

Aliphatic/aromatic primary amines are heated with chloroform/alcoholic $KOH$ to form foul smelling alkyl isocyanides or carbylamines. This test is not given by secondary/tertiary amines.
$R-N{H}_2+CHC{l}_3+3KOH\stackrel{\Delta }{\to }R-NC+3KCl+3H_{2}O$
For example, ethylamine gives ethyl isocyanide.
$C_2{H}_5-N{H}_2+CHC{l}_3+3KOH\stackrel{\Delta }{\to }{C}_2{H}_5-NC+3KCl+3H_{2}O$