Which of the following structures are aromati | vedclass

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(B) compound is aromatic if it is cyclic,planar,fully conjugated,and follows $H$ückel's rule ($4n+2$ $\pi$ electrons).$A$ (Cyclopentadienyl anion): It

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Only $A$ and $B$

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(B) compound is aromatic if it is cyclic,planar,fully conjugated,and follows $H$ückel's rule ($4n+2$ $\pi$ electrons).$A$ (Cyclopentadienyl anion): It has $6$ $\pi$ electrons ($4$ from double bonds + $2$ from the lone pair on the $sp^3$ carbon,which becomes $sp^2$ due to conjugation). It is cyclic,planar,and aromatic.$B$ (Tropylium cation): It has $6$ $\pi$ electrons. It is cyclic,planar,and aromatic.$C$ (Cyclooctatetraene derivative): It is non-planar (tub-shaped) to avoid anti-aromaticity,hence it is non-aromatic.$D$ (Cycloheptatrienyl anion): It has $8$ $\pi$ electrons ($4n$ system),making it anti-aromatic.Therefore,only $A$ and $B$ are aromatic.

Which of the following structures are aromatic in nature?

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