JEE Main Chemistry question

The correct sequence of decreasing order of reactivity of hydrolysis of acid chlorides is

(A)PhCOCl > p-O₂NC₆H₄COCl > p-CH₃OC₆H₄COCl
(B)PhCOCl > p-CH₃OC₆H₄COCl > p-O₂NC₆H₄COCl
(C)p-O₂NC₆H₄COCl > PhCOCl > p-CH₃OC₆H₄COClCorrect
(D)p-O₂NC₆H₄COCl > p-CH₃OC₆H₄COCl > PhCOCl

Answer: (C)

Solution

Hydrolysis of an aroyl chloride proceeds via nucleophilic addition at the carbonyl carbon; an electron-withdrawing para substituent (–NO₂) increases the carbonyl's electrophilicity,

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Question ID VK-149505