Keto-enol tautomerism is not observed in

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(A) Keto-enol tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to the carbonyl group $(C=O)$.In $C_6H_5COC_6H_5$ (ben

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$C_6H_5COC_6H_5$

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(A) Keto-enol tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to the carbonyl group $(C=O)$.In $C_6H_5COC_6H_5$ (benzophenone), the carbonyl carbon is attached to two phenyl groups $(C_6H_5)$.There is no $\alpha$-carbon with an $\alpha$-hydrogen atom available in this molecule.Therefore, it cannot exhibit keto-enol tautomerism.

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