Which of the following compounds is not aroma | vedclass

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(A) To determine aromaticity,we use $H$ückel's rule: a compound must be cyclic,planar,fully conjugated,and have $(4n + 2) \pi$ electrons.$A$. Cyclopen

Vedclass · Accepted Answer

Cyclopentadienyl cation

Vedclass · Answer

(A) To determine aromaticity,we use $H$ückel's rule: a compound must be cyclic,planar,fully conjugated,and have $(4n + 2) \pi$ electrons.$A$. Cyclopentadienyl cation: It has $4 \pi$ electrons. According to $H$ückel's rule,it is anti-aromatic.$B$. Pyrrole: It has $6 \pi$ electrons ($4$ from double bonds + $2$ from the lone pair on $N$). It is aromatic.$C$. Pyridine: It has $6 \pi$ electrons. It is aromatic.$D$. Cyclopentadienyl anion: It has $6 \pi$ electrons ($4$ from double bonds + $2$ from the negative charge). It is aromatic.Therefore,the cyclopentadienyl cation is not aromatic (it is anti-aromatic).

Which of the following compounds is not aromatic?

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