(B) The cyclopentadienyl anion is a cyclic,planar species with $6 \pi \ e^-$ (where $n=1$ in the $4n+2$ $H$ückel rule). Since it contains $6 \pi \ e^-

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(B) The cyclopentadienyl anion is a cyclic,planar species with $6 \pi \ e^-$ (where $n=1$ in the $4n+2$ $H$ückel rule). Since it contains $6 \pi \ e^-$,it follows $H$ückel's rule and is aromatic. Because it does not contain a benzene ring,it is classified as non-benzenoid. Therefore,it is non-benzenoid and aromatic.