Which of the following is an aromatic compoun | vedclass

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(A) For a compound to be aromatic,it must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons.$A$.

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Vedclass · Answer

(A) For a compound to be aromatic,it must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons.$A$. The cyclopentadienyl anion $(C_5H_5^-)$ has $6 \pi$ electrons (two from each of the two double bonds and two from the lone pair on the negatively charged carbon). It is cyclic,planar,and fully conjugated. Thus,it is aromatic.$B$. Cyclopentadiene is not fully conjugated because it contains an $sp^3$ hybridized carbon atom.$C$. The cyclopentadienyl dianion has $8 \pi$ electrons,which follows the $4n$ rule,making it anti-aromatic.$D$. The cyclopentadienyl cation has $4 \pi$ electrons,which follows the $4n$ rule,making it anti-aromatic.Therefore,the cyclopentadienyl anion is the aromatic compound.

Which of the following is an aromatic compound?

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