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Hydrocarbons

Question
CBSEENCH11007715

Give two examples of ions which are non-aromatic. Why don't they exhibit aromaticity?

Solution
Cyclopentadienyl cation and cyclo-heptatrienyl anion are non-aromatic. They do not exhibit aromaticity as they do not fulfil Huckel’s rule i.e. (4n + 2)straight pi electron rule.