Benzene sulphonyl chloride and aqueous NaOH can be used to distinguish

1.	Benzene sulphonyl chloride and aqueous NaOH can be used to distinguish three classes of amines such as primary, secondary and tertiary. a) Name the above test.b) How will you distinguish the above amines using this test?c) Give the reactions and justifications,
Answer» a) Hinsberg test. C₆H₅SO₂Cl b) 1° Amine + Hinsberg reagent → a compound soluble in alkali 2° Amine + Hinsberg reagent → A compound which is insoluble in alkali 3° Amine +Hinsberg reagent → no reaction. c) The hydrogen attached to nitrogen in sulphonamide is strongly acidic due to the presence of strong electron withdrawing sulphonyl group. Hence, it is soluble in alkali. Secondary amine react with benzene salphonyl chloride to form N, N-dialkylbenzene- sulphon-amide, which is insoluble in alkali. This is be?cause it does not contain any hydrogen attached to nitrogen atom and is not acidic. Tertiary amines do not react with benzene salphonyl chloride, because they do not possess any replacable hydrogen.

Benzene sulphonyl chloride and aqueous NaOH can be used to distinguish three classes of amines such as primary, secondary and tertiary. a) Name the above test.b) How will you distinguish the above amines using this test?c) Give the reactions and justifications,

Answer»

a) Hinsberg test. C₆H₅SO₂Cl

b) 1° Amine + Hinsberg reagent → a compound soluble in alkali

2° Amine + Hinsberg reagent → A compound which is insoluble in alkali

3° Amine +Hinsberg reagent → no reaction.

c) The hydrogen attached to nitrogen in sulphonamide is strongly acidic due to the presence of strong electron withdrawing sulphonyl group. Hence, it is soluble in alkali.

Secondary amine react with benzene salphonyl chloride to form N, N-dialkylbenzene- sulphon-amide, which is insoluble in alkali. This is be?cause it does not contain any hydrogen attached to nitrogen atom and is not acidic.

Tertiary amines do not react with benzene salphonyl chloride, because they do not possess any replacable hydrogen.

Benzene sulphonyl chloride and aqueous NaOH can be used to distinguish three classes of amines such as primary, secondary and tertiary. a) Name the above test.b) How will you distinguish the above amines using this test?c) Give the reactions and justifications,

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