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JEE Main levelSingle correct optionDifficulty 2 of 3o1190

Acid hydrolysis of acetamide with aqueous HCl goes essentially to completion because

Athe carbonyl oxygen stays permanently protonated
Bthe $NH X_{3}$ formed is converted to $NH X_{4} X^{+}$ , which is not nucleophilic and cannot re-attack the acid
Cthe carboxylic acid formed is decarboxylated
Dthe amide is converted irreversibly to the nitrile

Answer: B

After the tetrahedral intermediate expels the amine fragment as

NH X_{3}

, it is protonated at once to

NH X_{4} X^{+}

, which has no lone pair for the reverse reaction. This makes the overall hydrolysis effectively irreversible.

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