Primary, Secondary and tertiary amines can be distinguished by

Hinsberg’s reagent (benzene sulphonyl chloride) is used to distinguish1°, 2°, and 3° amines.With Hinsberg’s reagent, 1° amines give a sulphonamide, soluble in alkali.2° amines form a sulphonamide, insoluble in alkali while 3° amines do not react at all.