Question

give a chemical test to distinguish between ethylamine and di ethylamine

Answer 1

We can apply Hinsberg's test to distinguish between primary and secondary amines.

Primary amine ( ethylamine) reacts with benzenesulphonyl chloride forming ethyl benzenesulphonamide, which is soluble in alkali.

Secondary amine ( diethyl amine) reacts with benzenesulphonyl chloride forming diethyl benzenesulphonamide, which is insoluble in alkali.