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Question

Which of the following statements are correct about E1cB reaction?

A
It proceeds via the formation of a carbanion intermediate.
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B
Strong EWG and poor leaving groups favour the reaction
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C
It is a unimolecular reaction with second order kinetics
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D
When D is incorporated in the starting material by the solvent EtOD and the reaction is interrupted before completion, no D is found either in the substrate or in the product
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Solution

The correct options are
A It proceeds via the formation of a carbanion intermediate.
B Strong EWG and poor leaving groups favour the reaction
D It is a unimolecular reaction with second order kinetics
Statements (a),(b),(c) are the characteristics of E1cB reaction. Statement (d) is wrong since, in E1cB reaction, the deuterated product is obtained.

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