Which of the following are classified as aromatic?

1,2,3-Triphenylcyclopropenium cation

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Cyclooctatetraenyl dianion

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Azulene

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Annulene

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Solution

The correct options are
A 1,2,3-Triphenylcyclopropenium cation
B Azulene
D Cyclooctatetraenyl dianion
1,2,3-Triphenylcyclopropenium cation, Cyclooctatetraenyl dianion and Azulene are aromatic. They contain $(4 n + 2)$ $π$ electrons and obey huckel's rule.

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