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JEE Main levelOne or more correct optionsDifficulty 2 of 3o4180

Which statements about the E2 mechanism are correct?

  1. AIt is a single concerted step with no intermediate.
  2. BThe rate depends on the concentrations of both the substrate and the base.
  3. CRearrangement of the carbon skeleton is characteristic of the mechanism.
  4. DThe beta C-H bond and the leaving group are anti-periplanar in the preferred transition state.

Answer: A, B, D

E2 is concerted, so there is no carbocation and no rearrangement; this rules out the third statement. The rate law is second order, first order each in substrate and base, and the preferred transition state is anti-periplanar. Statements 1, 2 and 4 are correct.
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