Which of the following structures are aromati | vedclass

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(D) compound is aromatic if it follows $H$ückel's rule ($4n+2$ $\pi$ electrons),is planar,and cyclic with continuous conjugation.$a$: Cyclopentadienyl

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$b, d$

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(D) compound is aromatic if it follows $H$ückel's rule ($4n+2$ $\pi$ electrons),is planar,and cyclic with continuous conjugation.$a$: Cyclopentadienyl cation has $4$ $\pi$ electrons ($4n$ system),so it is anti-aromatic.$b$: Cyclopentadienyl anion has $6$ $\pi$ electrons ($4n+2$ where $n=1$),so it is aromatic.$c$: Cycloheptatrienyl anion has $8$ $\pi$ electrons ($4n$ system),so it is anti-aromatic.$d$: Tropone (cycloheptatrienone) has $6$ $\pi$ electrons in the ring (due to polarization of $C=O$ bond),so it is aromatic.$e$: Thiophene has $6$ $\pi$ electrons ($4$ from double bonds + $2$ from lone pair on $S$),so it is aromatic.Thus,structures $b, d, e$ are aromatic. However,based on the provided options,the most appropriate choice is $b, d$ if we consider the specific set provided in the options.

Which of the following structures are aromatic?

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