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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3g1247

The aromatic reference compound is shown for comparison. Select all of the planar species shown that are aromatic.

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: A, C, D

Apply 4n+2. The cyclopropenyl cation has 2 pi electrons, the cyclopentadienyl anion has 6 and the tropylium cation has 6, so these are aromatic. The cyclopentadienyl cation has 4 and is antiaromatic.
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