Explanation:
Hinsberg's reagent (benzene sulphonyl chloride) is used to distinguish \(1^{\circ}, 2^{\circ}\) and \(3^{\circ}\) amines. With Hinsberg's reagent, \(1^{\circ}\) amines give a sulphonamide, soluble in alkali; \(2^{\circ}\) amines form a sulphonamide, insoluble in alkali while, \(3^{\circ}\) amines do not react at all.