Question

The amine, which reacts with p-toluenesulphonyl chloride to give a clear solution, which on acidification gives insoluble compound is ______.

Options

• \[\ce{C2H5NH2}\]

• \[\ce{(C2H5)NH}\]

• \[\ce{(C2H5)3N}\]

• \[\ce{CH3NHC2H5}\]

Answer 1

The amine, which reacts with p-toluenesulphonyl chloride to give a clear solution, which on acidification gives insoluble compound is \[\underline{\ce{C2H5NH2}}\].

Explanation:

1°, 2° and 3° amines can be distinguished from each other by p-toluenesulphonyl chloride (Hinsberg reagent). Among which 1° amine on sulphonation gives a product, which is insoluble in acid.