Which of the following cation/anion is not ar | vedclass

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

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Cyclopentadienyl cation

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(D) To determine if a species is aromatic,it must follow $H$ückel's rule ($4n+2$ $\pi$ electrons,where $n=0, 1, 2, ...$) and be planar and cyclic.$A$. Cyclopentadienyl anion: It has $6$ $\pi$ electrons ($4$ from double bonds + $2$ from the lone pair on the carbon atom),which follows $4n+2$ $(n=1)$. It is aromatic.$B$. Tropylium cation: It has $6$ $\pi$ electrons ($3$ double bonds),which follows $4n+2$ $(n=1)$. It is aromatic.$C$. Cyclopropenyl cation: It has $2$ $\pi$ electrons ($1$ double bond),which follows $4n+2$ $(n=0)$. It is aromatic.$D$. Cyclopentadienyl cation: It has $4$ $\pi$ electrons ($2$ double bonds),which follows $4n$ $(n=1)$. It is anti-aromatic,not aromatic.

Which of the following cation/anion is not aromatic?

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