Question

Which of the following statements is/are correct about $E1cB$ reaction?

• A. It proceeds via the formation of carbanion intermediate.
• B. Strong EWG and poor leaving group favors the reaction.
• C. It is a unimolecular reaction
• D. It proceeds via the formation of carbocation intermediate.

Answer 1

Answer: (A), (B), (C)

It is a unimolecular reaction

E1cB proceeds via the formation of carbanion intermediate (stable conjugate base).
Strong EWG at the $\beta$ carbon and poor leaving group favors the E1cB reaction.
E1cB is a unimolecular reaction, the rate of the reaction depends on the formation of resonance stabilised conjugate base.
Thus, statement (d) is incorrect.