Which of the following is an aromatic compoun | vedclass

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(A) Aromatic compounds must satisfy $H$ückel's rule,which states that a planar,cyclic,conjugated system must have $(4n + 2) \pi$ electrons,where $n$ i

Vedclass · Accepted Answer

Pyridine

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(A) Aromatic compounds must satisfy $H$ückel's rule,which states that a planar,cyclic,conjugated system must have $(4n + 2) \pi$ electrons,where $n$ is an integer $(n = 0, 1, 2, ...)$.$1$. Pyridine $(C_5H_5N)$: It is a cyclic,planar,and fully conjugated system with $6 \pi$ electrons $(n=1)$. It is aromatic.$2$. Pyrrole $(C_4H_5N)$: It is a cyclic,planar,and fully conjugated system with $6 \pi$ electrons ($4$ from double bonds + $2$ from the lone pair on nitrogen). It is aromatic.$3$. Piperidine $(C_5H_{11}N)$: It is a saturated cyclic amine. It is not planar and lacks conjugation. It is non-aromatic.$4$. Aniline $(C_6H_5NH_2)$: It is a benzene derivative with an amino group. It is aromatic.Note: In the context of this question,all options except Piperidine are aromatic. However,if this is a single-choice question,Pyridine is a classic heterocyclic aromatic compound often used as an example.

Which of the following is an aromatic compound?

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