MolSynapsequestion bank
MolSynapse / Question bank / Organic Reaction Mechanisms IV: Elimination / E1 mechanism and carbocation rearrangement
NEET levelSingle correct optionDifficulty 1 of 3o4003

In the E1 mechanism, the slowest (rate-determining) step is

  1. Aremoval of a beta-hydrogen by the base
  2. Bionisation of the substrate to give a carbocation
  3. Csimultaneous removal of a beta-hydrogen and the leaving group
  4. Dattack of the nucleophile on the carbocation

Answer: B

In E1 the substrate first ionises to a carbocation and a leaving group; this heterolysis has the highest barrier. Loss of the beta-proton to the solvent from the carbocation is fast.
Practice Organic Reaction Mechanisms IV: Elimination More on E1 mechanism and carbocation rearrangement
Previous questionNext question

More questions on E1 mechanism and carbocation rearrangement