Which of the following is antiaromatic?

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(B) To determine if a compound is antiaromatic,it must satisfy the following conditions:$1$. It must be cyclic and planar.$2$. It must be fully conjug

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Cyclopentadienyl cation

Vedclass · Answer

(B) To determine if a compound is antiaromatic,it must satisfy the following conditions:$1$. It must be cyclic and planar.$2$. It must be fully conjugated.$3$. It must have $4n$ $\pi$ electrons (where $n = 1, 2, 3, ...$).Let's analyze the options:$A$: Cyclopropenyl cation has $2$ $\pi$ electrons ($4n+2$ with $n=0$),so it is aromatic.$B$: Cyclopentadienyl cation has $4$ $\pi$ electrons ($4n$ with $n=1$),so it is antiaromatic.$C$: Benzene has $6$ $\pi$ electrons ($4n+2$ with $n=1$),so it is aromatic.$D$: Cycloheptatrienyl cation has $6$ $\pi$ electrons ($4n+2$ with $n=1$),so it is aromatic.Therefore,the cyclopentadienyl cation is antiaromatic.

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