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Manipal MET2016ChemistryGeneral Organic Chemistry

Which one of the following is aromatic?

Options

  1. ACycloheptatrienyl cation
  2. BCycloheptrariene
  3. CCyclooctateraene
  4. DCyclopentadienyl cation

Correct answer

A. Cycloheptatrienyl cation

Step-by-step solution

To be aromatic the following conditions must be fulfilled. (i) Molecules should have (4 +2) -electrons in conjugation. (ii) Molecule should be planar. Cycloheptatriene has (4 n+2) -electrons, but not in conjugation.

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