Enol content is highest in

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(D) The enol content is highest in acetyl acetone $(CH_3COCH_2COCH_3)$ because it forms an intramolecular hydrogen-bonded stable six-membered ring in

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Acetyl acetone

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(D) The enol content is highest in acetyl acetone $(CH_3COCH_2COCH_3)$ because it forms an intramolecular hydrogen-bonded stable six-membered ring in its enolic form.Additionally,the enol form is stabilized by conjugation between the $C=C$ double bond and the $C=O$ carbonyl group.The percentage of the enolic form in acetyl acetone is approximately $76\%$,which is significantly higher than in simple ketones like acetone or acetophenone.

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