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Question

Hyperconjugation is not observed in:

A
A free radical (CH2)
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B
A carbanion (CH2)
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C
A carbocation (+CH2)
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D
A double bond >C=C<
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Solution

The correct option is B A carbanion (CH2)
Hyperconjugation :
It is a stabilising effect due to the reason that octet of carbon is always complete. Stability is also increased due to the delocalisation of sigma-pi electrons.

Condition for hyperconjugation :
Atleast one α hydrogen has to be present.

Hyperconjugation is mainly observed in:
1. A free radical (CH2)
2. A carbocation (+CH2)
3. A double bond >C=C<
It is not observed in carbanion because of its fully filled p-orbital (or octet).

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