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Question

Consider the following compounds:

Which of the following show hyperconjugation?

A
I only
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B
II only
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C
III only
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D
I and III
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Solution

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



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

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