Which of the following is not an aromatic com | vedclass

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

Vedclass · Accepted Answer

$1,3-$Cyclohexadiene

Vedclass · Answer

(B) To determine if a compound is aromatic,it must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and have $(4n+2) \pi$ electrons.$A$. Thiophene: Cyclic,planar,fully conjugated,and has $6 \pi$ electrons ($4$ from double bonds + $2$ from lone pair on $S$). It is aromatic.$B$. $1,3$-Cyclohexadiene: It is cyclic and planar,but it is not fully conjugated (the $sp^3$ carbons interrupt the conjugation). It has $4 \pi$ electrons. It is not aromatic.$C$. Tropylium cation: Cyclic,planar,fully conjugated,and has $6 \pi$ electrons. It is aromatic.$D$. Furan: Cyclic,planar,fully conjugated,and has $6 \pi$ electrons ($4$ from double bonds + $2$ from lone pair on $O$). It is aromatic.Therefore,$1,3$-Cyclohexadiene is not an aromatic compound.

Which of the following is not an aromatic compound?

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