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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3g1233

Select all correct statements about the ion shown.

  1. AThe negative charge is shared by the oxygen and the terminal carbon atom
  2. BThe carbon-oxygen bond has partial double-bond character
  3. CThe central carbon atom carries the negative charge in one contributor
  4. DEvery atom has a complete octet in both contributors

Answer: A, B, D

The ion shown is the enolate of acetone. Charge is shared by oxygen and the terminal CH2 carbon, so A is true; the C-O bond gains partial double-bond character, so B is true. The central carbon is the one that carries the C=C bond and never carries the charge, so C is false. Both contributors have complete octets on all atoms, so D is true.
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