Which of the following compounds is/are aroma | vedclass

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(D) compound is aromatic if it is cyclic,planar,fully conjugated,and follows $H$ückel's rule ($4n+2$ $\pi$ electrons,where $n=0, 1, 2, ...$).$(a)$ Azu

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All of the above $(a, b, c, d)$

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(D) compound is aromatic if it is cyclic,planar,fully conjugated,and follows $H$ückel's rule ($4n+2$ $\pi$ electrons,where $n=0, 1, 2, ...$).$(a)$ Azulene: It is a bicyclic aromatic hydrocarbon with $10$ $\pi$ electrons $(n=2)$.$(b)$ Indole: It is a bicyclic heterocyclic compound with $10$ $\pi$ electrons $(n=2)$.$(c)$ Quinoline: It is a bicyclic heterocyclic compound with $10$ $\pi$ electrons $(n=2)$.$(d)$ Tropolone: It is a cyclic,planar,conjugated system with $6$ $\pi$ electrons $(n=1)$.Since all the given compounds satisfy the conditions for aromaticity,the correct option is $D$.

Which of the following compounds is/are aromatic?

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