Primary amine gives soluble compound.
The secondary and tertiary amines gives insoluble compounds.
The secondary amine reacts with benzenesulfonyl chloride to give insoluble compound which is insoluble in alkali.
(આપેલ : આણ્વિય દળ : $C : 12.0\, u , H : 1.0 \,u,N : 14.0\, u , O : 16.0\, u , Cl : 35.5\, u )$