The acid which does not form an anhydride when treated with P2O5 is

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The acid which does not form an anhydride when treated with P₂O₅ is

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Benzoic acid

formic acid

propionic acid

acetic acid

answer is A.

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Detailed Solution

Phosphorus pentoxide is a dehydrating agent. It abstracts a molecule of water from formic acid to form carbon dioxide.

$HCOOH \overset{P_{2} O_{5}}{\to} {CO}_{2} + H_{2} O$

Thus, formic acid which does not form an anhydride when treated with P₂O₅.

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