How can you distinguish between CH₃CH₂ NH₂ and
(CH₃CH₂)₂NH by Hinsberg test?
 

Solution

Benzene sulphonyl chloride (C₆H₅SO₂Cl) (known as Hinsberg's reagent) reacts with 1 and 2 amines to form sulphonamides.With primary (1) amine it forms a product which is soluble in alkali

With secondary (2) amine it forms a product which is not soluble in alkali

No reaction with tertiary (3) amines

This reaction is used for the distinction of 1, 2 and 3 amines.