(A) The cyclopentadienyl anion $(C_5H_5^-)$ has a cyclic structure with $sp^2$ hybridized carbon atoms,making it planar. It contains $6 \pi$-electrons

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(A) The cyclopentadienyl anion $(C_5H_5^-)$ has a cyclic structure with $sp^2$ hybridized carbon atoms,making it planar. It contains $6 \pi$-electrons ($4$ from the two double bonds and $2$ from the lone pair on the negatively charged carbon),which follows $H$ückel's rule ($4n + 2 = 6$,where $n = 1$). Therefore,it is aromatic.