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JEE Advanced levelSingle correct optionDifficulty 3 of 3g1161

Which pair consists of two aromatic species?

  1. Acyclopropenyl cation and cyclopentadienyl anion
  2. Bcyclopropenyl anion and tropylium cation
  3. Ccyclopentadienyl cation and cycloheptatrienyl anion
  4. Dcyclobutadiene and cyclopentadienyl cation

Answer: A

Cyclopropenyl cation (2 pi e) and cyclopentadienyl anion (6 pi e) both obey . In the other pairs, cyclopropenyl anion (4 pi e), cyclopentadienyl cation (4), cycloheptatrienyl anion (8) and cyclobutadiene (4) are not aromatic; only tropylium (6 pi e) is aromatic.
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