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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12008728

Account for the fact that the C—O bond in RCOOH is shorter than in ROH ?

Solution
There are two resonating structures of RCOOH.


Due to this resonance, there is some double-bond character in the C—O bond of the acid, which shortens its bond length.
In case of ROH,there is no any resonating structure thus C-O bond is larger in it.