Which of the following is not an aromatic spe | vedclass

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Question

(A) To determine if a species is aromatic,it must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n+2) \pi$ electrons

Vedclass · Accepted Answer

Cyclopentadienyl cation $(C_5H_5^+)$

Vedclass · Answer

(A) To determine if a species is aromatic,it must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n+2) \pi$ electrons,where $n$ is an integer $(0, 1, 2, ...)$.$A$. Cyclopentadienyl cation $(C_5H_5^+)$: It has $4 \pi$ electrons (anti-aromatic).$B$. Cyclopentadienyl anion $(C_5H_5^-)$: It has $6 \pi$ electrons $(n=1)$,so it is aromatic.$C$. Cycloheptatrienyl cation $(C_7H_7^+)$: It has $6 \pi$ electrons $(n=1)$,so it is aromatic.$D$. Naphthalene $(C_{10}H_8)$: It has $10 \pi$ electrons $(n=2)$,so it is aromatic.Therefore,the cyclopentadienyl cation is not aromatic.

Which of the following is not an aromatic species?

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