Q.

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

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a

Benzoic acid

b

formic acid

c

propionic acid

d

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.

HCOOHP2O5CO2+H2O

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

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