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Ordinarily the barrier to rotation about...

Ordinarily the barrier to rotation about a carbon-carbon double bond is quite high but in compound P double bond between two rings was observed by NMR to have a rotational energy barrier of only about 20 cal/mol

The reason for this is

A

Double bond having partial triple bond character because of resonance

B

Double bond undergo flipping

C

Double bond having very high single bond character because of aromaticity gained in both three and five membered rings.

D

`+l` effect of `nC_3H_7` groups makes double bond having partial single bond character

Text Solution

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The correct Answer is:
C
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