JEE Main Chemistry question

Which one of the following pairs gives effervescence with aq. NaHCO₃? (I) CH₃COCl; (II) CH₃COCH₃; (III) CH₃COOCH₃; (IV) CH₃COOCOCH₃

(A)I and II
(B)I and IVCorrect
(C)II and III
(D)I and III

Answer: (B)

Solution

Effervescence with NaHCO₃ requires release of CO₂, which happens when the compound reacts with water/bicarbonate to generate a carboxylic acid in situ. Both acetyl chloride (I, hydrolyzes rapidly to acetic acid + HCl) and acetic anhydride (IV, hydrolyzes to two equivalents of acetic acid)

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Question ID VK-149282