Wrong match is

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is antiaromatic but not non-aromatic

is non-aromatic but not anti aromatic

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

(10) - annulene is not aromatic

answer is A.

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Detailed Solution

1)2) Monocyclic, planar, conjugated, polyenes having [4nπ] electrons are antiaromatic.3) Cyclic, non planar-non aromatic.Stability order : Aromatic > Non aromatic > Anti aromatic.First option is monocyclic, non planar,non aromaticIn 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 must 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 aromaticANNULENE: Monocyclic ring with alternate π and σ bonds having CnHn formula is called annulene. Annulene is represented by [n] Annulene .Here n = Number of carbons.

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