Which of the following is an aromatic compoun | vedclass

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(C) According to $H$ückel's rule,a compound is aromatic if it is cyclic,planar,fully conjugated,and contains $(4n + 2) \pi$ electrons,where $n = 0, 1,

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Cyclopentadienyl anion

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(C) According to $H$ückel's rule,a compound is aromatic if it is cyclic,planar,fully conjugated,and contains $(4n + 2) \pi$ electrons,where $n = 0, 1, 2, ...$.$(A)$ Cyclopentadiene: Not fully conjugated (has an $sp^3$ carbon).$(B)$ Cyclobutadiene radical cation: Contains $3 \pi$ electrons (not $4n+2$).$(C)$ Cyclopentadienyl anion: Contains $6 \pi$ electrons $(n=1)$,is cyclic,planar,and fully conjugated. Thus,it is aromatic.$(D)$ Cyclobutadiene radical anion: Contains $5 \pi$ electrons (not $4n+2$).

Which of the following is an aromatic compound?

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