Consider the following compounds

hyperconjugation occurs in

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 occurs through the H-atoms present on the carbon atom next to the double bond i.e. $α$ - hydrogen atoms.

There is no $α - H$ in the structures I and II.

So, hyperconjugation occurs in structure III only i.e.

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