Which of the following ring compounds obeys H | vedclass

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(C) Huckel's rule states that for a planar,cyclic,conjugated system to be aromatic,it must contain $(4n + 2) \pi$ electrons,where $n$ is an integer $(

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$C_4H_4^{-2}$

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(C) Huckel's rule states that for a planar,cyclic,conjugated system to be aromatic,it must contain $(4n + 2) \pi$ electrons,where $n$ is an integer $(n = 0, 1, 2, ...)$.For $C_4H_4^{-2}$ (cyclobutadienyl dianion):$1$. It is a cyclic and planar system.$2$. It has one double bond ($2 \pi$ electrons) and two negative charges on adjacent carbons,each contributing a lone pair to the conjugation ($2 + 2 + 2 = 6 \pi$ electrons).$3$. Applying Huckel's rule: $4n + 2 = 6 \implies 4n = 4 \implies n = 1$.Since $n$ is an integer,$C_4H_4^{-2}$ is aromatic and obeys Huckel's rule.

Which of the following ring compounds obeys Huckel's rule?

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