JEE Main Chemistry question

Which of the following does not exhibit tautomerism?

(A)The symmetric, cross-conjugated cyclohexadiene-dione (quinone-type) structureCorrect
(B)A simple cyclohexenone with an accessible α-H
(C)A 1,3-cyclohexanedione
(D)Another simple enone with an accessible α-H

Answer: (A)

Solution

Like p-benzoquinone, the fully conjugated, symmetric cyclic dione in (A) is locked in its cross-conjugated form without an sp³ α-hydrogen positioned to

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Question ID VK-139198