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(C) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group or a similar system that can migrate to form an enol o

Vedclass · Accepted Answer

$3$

Vedclass · Answer

(C) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group or a similar system that can migrate to form an enol or similar tautomer.$1$. Cyclohexa$-2,4-$dien$-1-$one: This compound has $\alpha$-hydrogens at the $C-6$ position,so it can show tautomerism.$2$. $p$-Benzoquinone monoxime: This compound has an oxime group $(=N-OH)$ and can exhibit nitroso-oxime tautomerism.$3$. $2,2,6,6$-Tetramethylcyclohexanone: This compound has no $\alpha$-hydrogens because all four $\alpha$-positions are substituted with methyl groups. Therefore,it cannot show keto-enol tautomerism.$4$. $4,4$-Dimethylcyclohexa$-2,5-$dien$-1-$one: This compound has $\alpha$-hydrogens at the $C-2$ and $C-6$ positions,so it can show tautomerism.Thus,compounds $1$,$2$,and $4$ show tautomerism. The total count is $3$.

How many of the following compounds show the phenomenon of tautomerism?

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