Which one of the following compounds is nonar | vedclass

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(A) To determine the aromaticity of a compound,we use $H$ückel's rule,which states that a planar,cyclic,fully conjugated system with $(4n+2) \pi$ elec

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Cyclooctatetraene

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(A) To determine the aromaticity of a compound,we use $H$ückel's rule,which states that a planar,cyclic,fully conjugated system with $(4n+2) \pi$ electrons is aromatic,while one with $4n \pi$ electrons is antiaromatic. Nonaromatic compounds are those that do not satisfy these conditions (e.g.,they may not be planar or fully conjugated).$1$. Cyclooctatetraene: It has $8 \pi$ electrons. It is not planar (it adopts a tub-shaped conformation) to avoid antiaromaticity,making it nonaromatic.$2$. Furan: It is a cyclic,planar,fully conjugated system with $6 \pi$ electrons (including the lone pair on oxygen),making it aromatic.$3$. Cyclobutadiene dication: It has $2 \pi$ electrons $(n=0)$,making it aromatic.$4$. Anthracene: It is a polycyclic aromatic hydrocarbon with $14 \pi$ electrons,making it aromatic.Therefore,cyclooctatetraene is nonaromatic.

Which one of the following compounds is nonaromatic?

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