Which of the following compounds will not und | vedclass

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(D) Tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to the carbonyl group (in keto-enol tautomerism) or a similar st

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$2,2,6,6-$Tetramethylcyclohexanone

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(D) Tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to the carbonyl group (in keto-enol tautomerism) or a similar structural requirement for other types.$A$: Cyclohex$-1-$en$-1-$ol is an enol,which can tautomerize to cyclohexanone.$B$: $2-$Methylcyclohexanone has an $\alpha$-hydrogen at the $C-2$ position,so it can undergo tautomerism.$C$: $2,6-$Dimethylcyclohexanone has $\alpha$-hydrogens at both $C-2$ and $C-6$ positions,so it can undergo tautomerism.$D$: $2,2,6,6-$Tetramethylcyclohexanone has no $\alpha$-hydrogen atoms because all four $\alpha$-positions (two at $C-2$ and two at $C-6$) are substituted with methyl groups. Therefore,it cannot undergo keto-enol tautomerism.

Which of the following compounds will not undergo tautomerism?

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