Total number of aromatic compounds from the f | vedclass

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(B) To identify aromatic compounds,we apply $H$ückel's rule,which states that a compound is aromatic if it is cyclic,planar,fully conjugated,and conta

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$3$

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(B) To identify aromatic compounds,we apply $H$ückel's rule,which states that a compound is aromatic if it is cyclic,planar,fully conjugated,and contains $(4n + 2) \pi$ electrons (where $n = 0, 1, 2, \dots$).$1$. Aniline: It is a benzene derivative,which is cyclic,planar,fully conjugated,and has $6 \pi$ electrons. It is aromatic.$2$. Naphthalene: It is a polycyclic aromatic hydrocarbon with $10 \pi$ electrons. It is aromatic.$3$. Cyclopentadienyl cation: It has $4 \pi$ electrons,which follows the $4n$ rule. It is anti-aromatic.$4$. $2,5-$Dihydrofuran: It is not fully conjugated due to the $sp^3$ hybridized carbon atom. It is non-aromatic.$5$. Pyridine: It is a heterocyclic compound with $6 \pi$ electrons. It is aromatic.Thus,the aromatic compounds are Aniline,Naphthalene,and Pyridine. The total number of aromatic compounds is $3$.

Total number of aromatic compounds from the following is:

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