Methyl amine `(1^(@)-"amine")` and dimethyl amine `(2^(@)-"amine")` are distinguished by iso cyanide test (or) Carbylamine test. Methyl amine responds to carbylamine reaction to produce methyl isocyanide where as dimethyl amine does not respond to the iso cyanide test
`CH_(3)NH_(2)+CHCl_(3)+ak.KOH overset(Delta)to underset("Methylisocynide (Foul smelline)")(CH_(3)NC+3KCl+3H_(2)O)`