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(B) For a compound to be aromatic,it must follow $H$ückel's rule,which states that the compound must be cyclic,planar,fully conjugated,and contain $(4

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Cycloheptatrienyl cation

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(B) For a compound to be aromatic,it must follow $H$ückel's rule,which states that the compound must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons,where $n$ is an integer $(n = 0, 1, 2, ...)$.$A$. Cyclopentadienyl cation: It has $4 \pi$ electrons. It is anti-aromatic.$B$. Cycloheptatrienyl cation (Tropylium ion): It is cyclic,planar,fully conjugated,and has $6 \pi$ electrons $(n = 1)$. Thus,it is aromatic.$C$. Pyrazine: It is a heterocyclic aromatic compound with $6 \pi$ electrons.$D$. Cyclooctatetraene: It is non-planar (tub-shaped) and has $8 \pi$ electrons. It is non-aromatic.Note: Both $B$ and $C$ are aromatic. However,in the context of typical multiple-choice questions of this type,the tropylium cation is a classic example of an aromatic ion.

Which of the following compounds would exhibit aromatic character?

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