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NEET levelSingle correct optionDifficulty 1 of 3o4038

In an E1cB elimination, the sequence of events is

  1. Aloss of the leaving group first, then proton removal
  2. Bloss of the proton and the leaving group simultaneously
  3. Closs of the leaving group, then attack of a nucleophile
  4. Dproton removal first, then loss of the leaving group

Answer: D

In E1cB the acidic beta-hydrogen is removed first by the base to give a carbanion; the leaving group departs in a second step from the carbanion.
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