Consider the following compounds:

Which of the following show hyperconjugation?

I only

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II only

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III only

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I and III

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Solution

The correct option is C III only
Hyperconjugation shown when there is presence of $α - H$ in the compound.
I and II do not have $α - H$ and will not show tautomerism.

Bridge carbon atom does not take participate in tautomerism. (III) has one $α - H$ and will show tautomerism.
Only I shows hyperconjugation.

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Hyperconjugation occurs in which of the above?

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