Which of the following compounds is not aroma | vedclass

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(C) To determine aromaticity,we use $H$ückel's rule,which states that a planar,cyclic,fully conjugated system is aromatic if it has $(4n + 2) \pi$ ele

Vedclass · Accepted Answer

Cyclooctatetraene $(C_8H_8)$

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(C) To determine aromaticity,we use $H$ückel's rule,which states that a planar,cyclic,fully conjugated system is aromatic if it has $(4n + 2) \pi$ electrons,where $n$ is an integer $(0, 1, 2, ...)$.$A$. Cyclobutadiene dication $(C_4H_4^{2+})$: It has $2 \pi$ electrons $(n=0)$,is cyclic,planar,and fully conjugated. It is aromatic.$B$. Cyclobutadiene dianion $(C_4H_4^{2-})$: It has $6 \pi$ electrons $(n=1)$,is cyclic,planar,and fully conjugated. It is aromatic.$C$. Cyclooctatetraene $(C_8H_8)$: It has $8 \pi$ electrons ($4n$ system). It is non-planar (tub-shaped) to avoid anti-aromaticity. Therefore,it is non-aromatic.$D$. Biphenyl $(C_{12}H_{10})$: It consists of two benzene rings joined together. It follows $H$ückel's rule and is aromatic.Thus,cyclooctatetraene is not aromatic.

Which of the following compounds is not aromatic?

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