Among the given compounds,which one is not ar | vedclass

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(B) The conditions for a compound to be aromatic are:$(i)$ The molecule should be planar.$(ii)$ It should be cyclic with a continuous system of conjug

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$(ii)$

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(B) The conditions for a compound to be aromatic are:$(i)$ The molecule should be planar.$(ii)$ It should be cyclic with a continuous system of conjugated $\pi$ electrons.$(iii)$ It should follow Huckel's rule,i.e.,it should have $(4n+2) \pi$ electrons,where $n = 0, 1, 2, \dots$Let us analyze the given compounds:$(i)$ Pyrrole: It has $6 \pi$ electrons ($4$ from double bonds + $2$ from the lone pair on $N$),which follows $(4n+2)$ rule $(n=1)$. It is aromatic.$(ii)$ Pentalene: It has $8 \pi$ electrons. This follows the $4n$ rule $(n=2)$,making it anti-aromatic,not aromatic.$(iii)$ Azulene: It has $10 \pi$ electrons,which follows $(4n+2)$ rule $(n=2)$. It is aromatic.$(iv)$ Oxazole: It has $6 \pi$ electrons ($4$ from double bonds + $2$ from the lone pair on $O$),which follows $(4n+2)$ rule $(n=1)$. It is aromatic.Thus,compound $(ii)$ is not aromatic.

Among the given compounds,which one is not aromatic?

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