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Q.

How many of the following are involved in tautomerism (Just see possibility of the concept)?

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answer is 4.

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Detailed Solution

  • For tautomerism, the condition is that the carbonyl group should have an alpha hydrogen, which is attached to the sp3 hybridized carbon atom for interconversion between keto and enol forms to occur. 
  • Structure II has aromatic character in its enol form.
  • Hence, three compounds exhibit tautomerism – II, III, and VIII
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