(a) Give chemical tests to distinguish between the following pairs of compounds.

(i) (CH₃)₂NH and (CH₃)₃N

(ii) Aniline and Ethylamine

(b) Write IUPAC name of CH₃CH₂NHCH₃.

(i) Chemical test to distinguish between (CH₂)₂NH (secondary amine) and (CH₃)₃N (tertiary amine) is reaction with benzenesulphonyl chloride.

Benzenesulphonyl chloride which is also known as Hinsberg’s Reagent reacts differently with primary, secondary and tertiary amines.

C₆H₅SOCl + (CH₃)₂NH¾ C₆H₅SON(CH₃)₂

N,N- Dimethylbenzenesulphonamide

This compound formed does not have any H- atom attached to N- atom. Hence, it is not acidic and product is insoluble n alkali.

C₆H₅SOCl + (CH₃)₃N¾ No reaction

Tertiary amines do not react with Benzenesulphonyl chloride.

(ii) Chemical test to distinguish between Aniline (aromatic amine) and Ethyl amine (aliphatic amine) is azo dye test.

A dye is produced when aniline is treated with HONO whereas brisk effervescence of N₂ gas is obtained when ethyl amine is treated under same conditions.

(b) IUPAC name of CH₃CH₂NHCH₃ is N-methylethanamine.

Here, the main chain is of 2 carbon and 1 nitrogen atom and the methyl group on N acts as a substituent.