Which of the following is not an aromatic com | vedclass

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(A) To determine if a compound is aromatic,it must follow $H$ückel's rule ($4n+2$ $\pi$ electrons,where $n=0, 1, 2, ...$),be planar,and have a cyclic

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(A) To determine if a compound is aromatic,it must follow $H$ückel's rule ($4n+2$ $\pi$ electrons,where $n=0, 1, 2, ...$),be planar,and have a cyclic conjugated system.$A$: Cyclopentadienyl cation has $4$ $\pi$ electrons ($n=1$ for antiaromatic,$4n$ rule). It is antiaromatic.$B$: Cycloheptatrienyl cation has $6$ $\pi$ electrons $(n=1)$,which is aromatic.$C$: Phenanthrene is a polycyclic aromatic hydrocarbon with $14$ $\pi$ electrons $(n=3)$,which is aromatic.$D$: Cyclopentadienyl anion has $6$ $\pi$ electrons $(n=1)$,which is aromatic.Therefore,the compound that is not aromatic is the cyclopentadienyl cation.

Which of the following is not an aromatic compound?

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