Which of the following are aromatic in charac | vedclass

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(C) To determine aromaticity,a compound must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$(I)$ Tropone: It i

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$I, II, III, V$

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(C) To determine aromaticity,a compound must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$(I)$ Tropone: It is aromatic because the oxygen atom pulls electrons,creating a $6$ $\pi$ electron system in the seven-membered ring.$(II)$ Benzimidazole: It is a bicyclic aromatic compound with $10$ $\pi$ electrons.$(III)$ Isothiazole: It is a five-membered heterocyclic aromatic compound with $6$ $\pi$ electrons.$(IV)$ $2H$-Pyran: It is non-aromatic because the $sp^3$ hybridized carbon atom breaks the conjugation.$(V)$ $1,4$-Naphthohydroquinone (or $1,4$-dihydroxynaphthalene): The naphthalene core is aromatic ($10$ $\pi$ electrons).$(VI)$ Cyclooctatetraene: It is non-aromatic (tub-shaped,non-planar) with $8$ $\pi$ electrons.Thus,compounds $(I, II, III, V)$ are aromatic.

Which of the following are aromatic in character?

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