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.

Column-$I$ (Name)	Column-$II$ (Structure)	Column-$III$ (Source)
$(A)$ Vanillin	$(i)$ $C_6H_4(OH)CHO$ (ortho)	$(p)$ From cinnamon
$(B)$ Salicylaldehyde	$(ii)$ $C_6H_5CH=CHCHO$	$(q)$ From seeds of vanilla
$(C)$ Cinnamaldehyde	$(iii)$ $C_6H_3(OH)(OCH_3)CHO$	$(r)$ From meadow sweet

Which of the following compounds will not undergo tautomerism?

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