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The first step of the E1cB mechanism is

  1. Aloss of the leaving group to give a carbocation
  2. Bconcerted loss of H and the leaving group
  3. Caddition of a nucleophile to the double bond
  4. Dremoval of a beta-hydrogen by a base to give a carbanion

Answer: D

E1cB means elimination, unimolecular, conjugate base. The substrate is first deprotonated at the acidic beta carbon to give its conjugate base (a carbanion), which then expels the leaving group.
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