Which of the following species is not aromati | vedclass

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(B) To determine aromaticity,a species must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$A.$ The $Cyclopenta

Vedclass · Accepted Answer

$B. 	ext{ Cyclopentadienyl cation}$

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(B) To determine aromaticity,a species must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$A.$ The $Cyclopentadienyl$ anion has $6$ $\pi$ electrons $(n=1)$,which follows $H$ückel's rule and is aromatic.$B.$ The $Cyclopentadienyl$ cation has $4$ $\pi$ electrons $(n=1)$,which follows the $4n$ rule and is anti-aromatic.$C.$ The $Cyclopentadienyl$ radical has $5$ $\pi$ electrons,which is non-aromatic as it is not fully conjugated (the $sp^3$ carbon breaks conjugation).$D.$ $Benzene$ has $6$ $\pi$ electrons $(n=1)$ and is aromatic.Given the options,$B$ is anti-aromatic and $C$ is non-aromatic. However,in standard textbook contexts for this specific question,$B$ is the intended answer as it is anti-aromatic.

Which of the following species is not aromatic?

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