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NEET levelSingle correct optionDifficulty 1 of 3g1235

The planar ion shown is

  1. Aaromatic, with 6 pi electrons
  2. Bantiaromatic, with 8 pi electrons
  3. Cnon-aromatic, because the ring contains an sp3 carbon
  4. Daromatic, with 8 pi electrons

Answer: A

The ion shown is the tropylium (cycloheptatrienyl) cation. The cationic carbon is sp2 with an empty p orbital, so the ring is fully conjugated with 6 pi electrons (4n+2, n = 1). It is aromatic.
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