Among the following,the aromatic compound is:

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(A) According to $H$ückel's rule for aromaticity,a molecule must be planar,cyclic,and possess a delocalized $(4n + 2) \, \pi$ electron system,where $n

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Cyclopropenyl cation

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(A) According to $H$ückel's rule for aromaticity,a molecule must be planar,cyclic,and possess a delocalized $(4n + 2) \, \pi$ electron system,where $n$ is an integer $(n = 0, 1, 2, 3, \dots)$.$1.$ The cyclopropenyl cation has $2 \, \pi$ electrons $(n = 0)$,making it aromatic.$2.$ Cyclobutadiene has $4 \, \pi$ electrons ($4n$ system),making it anti-aromatic.$3.$ The cyclopentadienyl cation has $4 \, \pi$ electrons ($4n$ system),making it anti-aromatic.$4.$ The cyclopropenyl anion has $4 \, \pi$ electrons ($4n$ system),making it anti-aromatic.Therefore,the cyclopropenyl cation is the aromatic compound.

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