How many of the given compounds show tautomer | vedclass

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(B) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group (or similar electron-withdrawing group) that can migra

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$3$

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(B) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group (or similar electron-withdrawing group) that can migrate to the oxygen atom.$1$. The first compound is a $1,3$-dicarbonyl derivative with an $\alpha$-hydrogen,so it shows tautomerism.$2$. The second compound is a bicyclic ketone with no $\alpha$-hydrogen available for tautomerization (the $\alpha$-carbon is fully substituted with methyl groups and bridgehead constraints),so it does not show tautomerism.$3$. The third compound is $p$-benzoquinone,which has $\alpha$-hydrogens and can undergo tautomerization to form hydroquinone,so it shows tautomerism.$4$. The fourth compound is acetophenone,which has $\alpha$-hydrogens on the methyl group,so it shows tautomerism.Thus,$3$ out of the $4$ compounds show tautomerism.

How many of the given compounds show tautomerism?

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