Which of the following compounds does not exh | vedclass

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Question

(C) Keto-enol tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to the carbonyl group $(C=O)$.$(1)$ $1,3$-cyclohexaned

Vedclass · Accepted Answer

$3$

Vedclass · Answer

(C) Keto-enol tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to the carbonyl group $(C=O)$.$(1)$ $1,3$-cyclohexanedione has $\alpha$-hydrogens and exhibits tautomerism.$(2)$ The structure shown has an $\alpha$-hydrogen at the $sp^3$ carbon,allowing for tautomerism.$(3)$ $1,4$-benzoquinone has no $\alpha$-hydrogen atoms adjacent to the carbonyl groups,as all carbons in the ring are either part of a double bond or bonded to the carbonyls,thus it cannot exhibit keto-enol tautomerism.$(4)$ This is an enol form itself,which can tautomerize to the corresponding aldehyde.Therefore,the correct answer is $3$.

Which of the following compounds does not exhibit keto-enol tautomerism?

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