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Why the bond length of two C,O bonds in ...

Why the bond length of two C,O bonds in carboxylate ions are equal?

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Two C, O bond lengths are equal due to resonance. Reasonance structures of `RCO O^(-)` ion are
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(A) Carboxylic acids contain a carbonyl group but do not give characteristic reactions of the carbonyl group. (R) Double bond character of C = O bond in carboxylic acids is greatly reduced due to resonance, as compared to that in aldehydes and ketones.

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AAKASH SERIES-GENERAL ORGANIC CHEMISTRY-QUESTIONS FOR DESCRIPTIVE ANSWERS
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