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Given CH3CH3, CH3CH3, CH3CH3 (I, II, III). Which of the given compounds can exhibit tautomerism?

1. I and III
2. II and III
3. I, II and III
4. I and II

Correct answer: I and III

Solution

Tautomerism requires the presence of a functional group like a carbonyl group (C=O) adjacent to a hydrogen atom. CH3CH3 (ethane) lacks such a functional group, so none of the given compounds can exhibit tautomerism.

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