Among the given organic compounds,the total n | vedclass

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

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$2$

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(B) To determine if a compound is aromatic,it must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$(A)$ Decalin derivative: Not fully conjugated,non-aromatic.$(B)$ Benzylcyclohexene: The benzene ring is aromatic,but the whole molecule is not considered a single aromatic system due to the $sp^3$ carbon bridge. However,in the context of identifying aromatic components,the benzene ring is aromatic.$(C)$ Indene anion (indenyl anion): The cyclopentadienyl ring is conjugated with the benzene ring,and the lone pair on the $sp^3$ carbon becomes part of the $10$ $\pi$ electron system $(n=2)$,making it aromatic.$(D)$ Fluorenyl anion: It has $14$ $\pi$ electrons $(n=3)$,is planar,and fully conjugated,making it aromatic.Thus,compounds $(C)$ and $(D)$ are aromatic. The total number is $2$.

Among the given organic compounds,the total number of aromatic compounds is $....$.

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