Which one of the following compounds is aroma | vedclass

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(D) To determine aromaticity,we apply $H$ückel's rule ($4n+2$ $\pi$ electrons in a planar cyclic system).$1$. Acenaphthene: It has $10$ $\pi$ electron

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Cyclopentadienyl anion

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(D) To determine aromaticity,we apply $H$ückel's rule ($4n+2$ $\pi$ electrons in a planar cyclic system).$1$. Acenaphthene: It has $10$ $\pi$ electrons in a cyclic conjugated system,making it aromatic.$2$. Cyclobutadiene: It has $4$ $\pi$ electrons in a cyclic conjugated system,making it anti-aromatic.$3$. $1$-Methylcyclopentadienyl cation: It has $4$ $\pi$ electrons in the ring,making it anti-aromatic.$4$. Cyclopentadienyl anion: It has $6$ $\pi$ electrons in a cyclic conjugated system,making it aromatic.Note: Both $1$ and $4$ are aromatic. Based on standard multiple-choice conventions for this specific question,the cyclopentadienyl anion is the most classic example of an aromatic ion.

Which one of the following compounds is aromatic in nature?

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