Which of the following are aromatic compounds | vedclass

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(A) To be aromatic,a compound must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n+2) \pi$ electrons.$I$ (Aniline):

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$I$,$II$ and $IV$

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(A) To be aromatic,a compound must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n+2) \pi$ electrons.$I$ (Aniline): It is cyclic,planar,and has $6 \pi$ electrons (fully conjugated). It is aromatic.$II$ (Pyridine): It is cyclic,planar,and has $6 \pi$ electrons (the lone pair on $N$ is in an $sp^2$ orbital and not part of the $\pi$ system). It is aromatic.$III$ (Pyrrolium cation): The nitrogen atom is $sp^3$ hybridized,making the ring non-planar. It is not aromatic.$IV$ (Pyrrole): It is cyclic,planar,and has $6 \pi$ electrons (the lone pair on $N$ participates in conjugation). It is aromatic.Thus,$I$,$II$,and $IV$ are aromatic.

Which of the following are aromatic compounds?

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