yeah pyrolle is aromatic where as its protonated form is not as there is an absence of lone pair for satisfying the huckel rule and for that computer001's doubt, layman you are rite!!!! its not anti aromatic but the rite explaination i feel is that for anti aromaticty you need the compund to be planar containing sp2 or sp groups but here N is sp3 and not planar condition not satisfied!!! now understood??
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