Question

③ which
ol the following shouctures
are alomatic?
​

Answer 1

$\huge\bf{AnswEr -}$

The cycloheptatrienyl (tropylium) cation is aromatic because it also has 6 electrons in its pi system. It is planar, cyclic and has conjugated system.

Answer 2

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=> It has two pi electrons, hence only one double bond. It is an exception to the rule of conjugation; it is aromatic. The cyclopropenyl cation possesses a ring current. The stabilization of aromaticity is weakened by the extreme ring strain.