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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12008769

Explain the reason why:

Carboxylic acids, despite the presence of C = O group in the molecule, do not form oximes, hydrazones, etc.

Solution
The double bond character of the C = O bond in carboxylic acid (and carboxylates) is greatly reduced due to resonance. Thus, carboxylic acid does not form oximes, hydrozones etc.