Q.

Tautomerism is not exhibited by

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a

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b

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c

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d

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answer is B.

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Detailed Solution

Benzoquinone does not exhibit tautomerism.

The presence ofα -hydrogen on a saturated carbon attached to C = O, NO, NO2, etc. or should have an H-atom present on a heteroatom (O, N, S, etc.) coupled to a double bond is a necessary requirement for tautomerism. Option (a) does not display tautomerism because it lacksα -hydrogen on a saturated carbon.

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