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JEE Main levelSingle correct optionDifficulty 2 of 3bm069

Glycine reacts with nitrous acid, $HNO X_{2}$ , to give

Ano reaction, because glycine exists as a zwitterion
Bhydroxyacetic acid with evolution of nitrogen gas
Can N-nitroso compound with no gas evolved
Da stable diazonium salt, $N X_{2} X^{+} - CH X_{2} - COOH$

Answer: B

The free primary aliphatic amino group reacts with

HNO X_{2}

like any primary aliphatic amine:

H X_{2} N - CH X_{2} - COOH + HNO X_{2} HO - CH X_{2} - COOH + N X_{2} + H X_{2} O

. Aliphatic diazonium salts are unstable and lose

N X_{2}

immediately.

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