MHT CET 2022 Chemistry question

Which among the following reaction forms acid anhydride?

(A)R - COOH treated with
(B)R - COOH treated with
(C)R - COOH (excess) heated in pressure of Correct
(D)R - COOH treated with R' - OH and heated

Answer: (C)

Solution

Carboxylic acids undergo intermolecular dehydration when heated with a strong dehydrating agent such as (or conc. ): . This gives the acid anhydride, so (C) is correct. With

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Question ID VK-093984