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JEE Main levelSingle correct optionDifficulty 2 of 3g1138

The number of electrons contributed by the oxygen atom of furan to its aromatic sextet is

  1. A0
  2. B2
  3. C4
  4. D1

Answer: B

The two ring double bonds contribute 4 pi electrons. One lone pair on oxygen lies in a p orbital and contributes 2 more, giving 6 pi electrons. The other lone pair is in the plane of the ring and is not part of the sextet.
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