Among the cyclic ions,the aromatic character | vedclass

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(C) To determine the aromatic character,we apply $H$ückel's rule,which states that a cyclic,planar,fully conjugated system with $(4n+2) \pi$ electrons

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$Q$ and $R$

Vedclass · Answer

(C) To determine the aromatic character,we apply $H$ückel's rule,which states that a cyclic,planar,fully conjugated system with $(4n+2) \pi$ electrons is aromatic.$(P)$ 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 carbon atom). It is aromatic.$(R)$ Cycloheptatrienyl cation: It has $6 \pi$ electrons. It is aromatic.$(S)$ Cycloheptatrienyl anion: It has $8 \pi$ electrons. It is anti-aromatic.Therefore,the aromatic ions are $Q$ and $R$.

Among the cyclic ions,the aromatic character is shown by $:-$

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