Wrongly matched structure and it's property is

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Question Image is antiaromatic but not non-aromatic

Question Image is non-aromatic but not anti aromatic

rotation about the double bond connecting the rings is most feasible.

Question Image (10) - annulene is not aromatic

answer is A.

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Detailed Solution

Monocyclic, planar, conjugated, polyenes having [4nπ] electrons are antiaromatic.

Cyclic, non planar-non aromatic.

Stability order : Aromatic > Non aromatic > Anti aromatic.

First option is monocyclic, non planar,non aromatic

In second form both the rings acquires aromaticity and hence the above compound mainly exist in second form .In second form the two rings are connecting through single bond and hence free rotation about single bond is most feasible.

[10] annulene adopts non-planar geometry, due to repulsions among the trans annular hydrogens and hence, eventhough it follows the Huckel's rule it is non aromatic

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