Answer. Amines contain carbon, hydrogen and nitrogen in their functional group.
Their functional group is -NH2, and their general formula is R-NH2
Primary amines: Only one hydrogen atom of an ammonia molecule has been replaced by alkyl group. For example, methyl amine
H3C-NH2
Methylamine
Secondary amine: Two hydrogen atoms of an ammonia molecule have been replaced by two alkyl groups. For example, diethyl amine
H3C-NH2
CH3
Dim ethylamine
Tertiary amines: In a tertiary amine, all of the hydrogen atoms of an ammonia' molecule have been replaced by three alkyl groups. For example, trimethyl amine
H3C-N-CH3
CH3
Trim ethylamine
Identification
Primary amino group is identified by Carbyl amine test. Heat about 0.2 g of the given compound and add 0.5 cm3 of chloroform and add 2-3 cm3 of alcoholic KOH, extremely unpleasant odour will be given out which confirm primary amino group.