Which of the following compounds or ions is n | vedclass

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(B) Aromatic compounds must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons ($H$ückel's rule).$1$. Pyridine: Cyclic,planar,full

Vedclass · Accepted Answer

Cyclopentadienyl cation

Vedclass · Answer

(B) Aromatic compounds must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons ($H$ückel's rule).$1$. Pyridine: Cyclic,planar,fully conjugated,and has $6 \pi$ electrons $(n=1)$. It is aromatic.$2$. Cyclopentadienyl cation: Cyclic,planar,but has only $4 \pi$ electrons ($n=1$ for $4n$ rule). It is antiaromatic.$3$. Anthracene: Cyclic,planar,fully conjugated,and has $14 \pi$ electrons $(n=3)$. It is aromatic.$4$. Furan: Cyclic,planar,fully conjugated (lone pair on oxygen participates),and has $6 \pi$ electrons $(n=1)$. It is aromatic.Therefore,the cyclopentadienyl cation is not aromatic.

Which of the following compounds or ions is not aromatic?

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