Keto-enol tautomerism is not observed in

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Question

(A) For a compound to exhibit keto-enol tautomerism,it must possess at least one $\alpha$-hydrogen atom attached to an $\alpha$-carbon (the carbon ato

Vedclass · Accepted Answer

$C_6H_5COC_6H_5$

Vedclass · Answer

(A) For a compound to exhibit keto-enol tautomerism,it must possess at least one $\alpha$-hydrogen atom attached to an $\alpha$-carbon (the carbon atom adjacent to the carbonyl group).$1$. $C_6H_5COC_6H_5$ (Benzophenone): The carbonyl carbon is attached to two phenyl groups. There are no $\alpha$-hydrogen atoms present on the carbons adjacent to the carbonyl group. Therefore,it cannot show keto-enol tautomerism.$2$. $C_6H_5COCH_3$ (Acetophenone): It has three $\alpha$-hydrogen atoms on the methyl group attached to the carbonyl carbon,so it exhibits tautomerism.$3$. $C_6H_5COCH_2COCH_3$ and $CH_3COCH_2COCH_3$: Both contain active methylene groups $(-CH_2-)$ between two carbonyl groups,which have acidic $\alpha$-hydrogens,allowing for keto-enol tautomerism.Thus,the correct option is $A$.

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