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JEE Main levelOne or more correct optionsDifficulty 2 of 3g1075

Which of the following species are aromatic?

  1. Acyclopropenyl cation,
  2. Bcyclopentadienide anion,
  3. Ccyclopentadienyl cation,
  4. Dcycloheptatrienyl (tropylium) cation,

Answer: A, B, D

The cyclopropenyl cation has 2 electrons, the cyclopentadienide anion has 6 and the tropylium cation has 6. All three are planar, cyclic and fully conjugated, so they are aromatic. The cyclopentadienyl cation has 4 electrons and is antiaromatic.
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