Carboxylic acids contain carbonyl group but do not show the nucleophilic addition reaction like aldehydes or ketones. Why?


Carboxylic acid contain carbonyl group but do not show nucleophilic addition reaction like aldehyde and ketone. Due to resonance as shown below the partial Positive charge on carbonyl carbon atom is reduced.
                                     O                            O-
    ||                             |
COHC=O+H