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Four structures are given in options (a)...

Four structures are given in options (a) to (d) . Examine them and select the aromatic structures.

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A, C
Cyclopropenyl cation (a) has completely delocalized `2pi`-electrons. Therefore , in accordance with Huckel rule, it is aromatic.
Cyclooctatetraene is not planar and also it has `8pi`-electrons. Therefore, in accordance with Huckel rule , it is not aromatic.
(c )Diphenyl has two benzene rings each one of which is planar and has 6 `pi`-electrons . Therefore, like benzene, it is also aromatic.
(d)Cyclopropenyl anion although planar has only 4 `pi`-electron. Therefore, in accordance with Huckel rule, it is not aromatic.
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