Which among the given molecules can exhibit tautomerism?

III only

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Both I and III

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Both I and II

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Both II and III

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Solution

The correct option is A
III only

In tautomerism, $α$ - hydrogen must be present in the molecule. Thus, molecule II will not show tautomerism. As at bridge, double bond is highly unstable. Thus, molecule I will also not show tautomerism.

For III molecule,So only, III molecule will show tautomerism.

Thus, correct option is (a)

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