Cyclooctatetraene is expected to have

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(B) Cyclooctatetraene $(C_8H_8)$ is an anti-aromatic compound if it were planar,according to $H$ückel's rule ($4n \pi$ electrons,where $n=2$).To avoid

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a tub-shaped structure

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(B) Cyclooctatetraene $(C_8H_8)$ is an anti-aromatic compound if it were planar,according to $H$ückel's rule ($4n \pi$ electrons,where $n=2$).To avoid this instability and minimize angle strain,the molecule adopts a non-planar,tub-shaped conformation.This conformation breaks the continuous conjugation of the $\pi$ system,making it non-aromatic rather than anti-aromatic.

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