Among the following cyclic ions,which exhibit | vedclass

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(C) To determine aromaticity,a molecule must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons.$(

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$Q$ and $R$

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(C) To determine aromaticity,a molecule must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons.$(P)$ Cyclopentadienyl cation: It has $4 \pi$ electrons. It is anti-aromatic.$(Q)$ Cyclopentadienyl anion: It has $6 \pi$ electrons ($4$ from double bonds + $2$ from the lone pair on the $sp^3$ carbon which becomes $sp^2$ to allow conjugation). It is aromatic.$(R)$ Cycloheptatrienyl cation (tropylium ion): It has $6 \pi$ electrons. It is aromatic.$(S)$ Cycloheptatrienyl anion: It has $8 \pi$ electrons. It is anti-aromatic.Thus,$Q$ and $R$ are aromatic.

Among the following cyclic ions,which exhibit aromatic character?

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