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NEET2016ChemistryGeneral Organic ChemistryActual

Which of the following species is not aromatic?

Options

  1. ABenzene
  2. BCyclooctatetraenyl dianion
  3. CTropylium ion
  4. DCyclopentadienyl cation

Correct answer

D. Cyclopentadienyl cation

Step-by-step solution

On applying the Hückel rule, [(4 n+2) electron] system,

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