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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., showing that it has lot of single bond character.

The reason for this is

A

Double bond having partial triple bond character because of resonance

B

Double bond undergoes flipping

C

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

D

`+I` effect of `nC_(3)H_(7)` groups makes double bond having partial single bond character.

Text Solution

Verified by Experts

The correct Answer is:
C
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