Which of the following is aromatic?

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(D) Aromatic compounds must follow $H$ückel's rule,which states that the molecule must be cyclic,planar,fully conjugated,and contain $(4n+2) \pi$ elec

Vedclass · Accepted Answer

Naphthalene

Vedclass · Answer

(D) Aromatic compounds must follow $H$ückel's rule,which states that the molecule must be cyclic,planar,fully conjugated,and contain $(4n+2) \pi$ electrons,where $n$ is an integer $(n=0, 1, 2, ...)$.$A$. Cyclopentadiene is non-aromatic because it has an $sp^3$ hybridized carbon atom.$B$. $4H$-Pyran is non-aromatic due to the presence of an $sp^3$ hybridized carbon atom.$C$. The structure shown is a borabenzene derivative or a related cyclic system that does not satisfy the $(4n+2) \pi$ electron rule for aromaticity.$D$. Naphthalene is a polycyclic aromatic hydrocarbon. It is planar,fully conjugated,and contains $10 \pi$ electrons,which satisfies the $(4n+2) \pi$ rule for $n=2$ $(4(2)+2 = 10)$.Therefore,naphthalene is aromatic.

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