Tautomerism is exhibited by:

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(A) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group or a similar system that allows for proton transfer.$(

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$1, 3$ and $4$

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(A) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group or a similar system that allows for proton transfer.$(1)$ The enol form shown can tautomerize to a keto form (phenylacetaldehyde).$(2)$ $p$-Benzoquinone has no $\alpha$-hydrogen atoms available for tautomerization,so it does not exhibit tautomerism.$(3)$ This is a cyclic diketone with $\alpha$-hydrogen atoms,which can tautomerize to form an enol.$(4)$ This is a cyclic diketone (cyclohexane$-1,2-$dione) with $\alpha$-hydrogen atoms,which can tautomerize to form an enol.Therefore,compounds $1, 3,$ and $4$ exhibit tautomerism.

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