Which of the following compounds is not aroma | vedclass

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(A) Aromatic compounds satisfy the $(4n+2) \pi$ $H$ückel rule.$(A)$ Cyclobutadiene: Number of $\pi$ electrons $= 4$. Since it is not equal to $4n+2$,i

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Cyclobutadiene

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(A) Aromatic compounds satisfy the $(4n+2) \pi$ $H$ückel rule.$(A)$ Cyclobutadiene: Number of $\pi$ electrons $= 4$. Since it is not equal to $4n+2$,it is anti-aromatic,not aromatic.$(B)$ Pyridine: Number of $\pi$ electrons $= 6$ ($4n+2$,where $n=1$). The lone pair on $N$ is not involved in delocalization.$(C)$ Furan: Number of $\pi$ electrons $= 4 + 2 = 6$ ($4n+2$,where $n=1$).$(D)$ Thiophene: Number of $\pi$ electrons $= 4 + 2 = 6$ ($4n+2$,where $n=1$).Thus,except cyclobutadiene,all other species are aromatic.

Which of the following compounds is not aromatic?

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