Assertion: E1cB reaction is favoured by stabilisation of carbanion and poor leaving group
Reason: The reaction is kinetically of the second-order and unimolecular
Assertion: E1cB reaction is favoured by stabilisation of carbanion and poor leaving group
Reason: The reaction is kinetically of the second-order and unimolecular
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
E1cB reaction is a second-order and unimolecular reaction. The reaction proceeds in two steps. In the first step, the base abstracts an acidic hydrogen atom from the beta carbon atom to form the carbanion transition state, which is stabilized by resonance. In the second step, the lone pair of electrons on the anion moves to the neighbouring atom forming a pi bond with elimination of leaving group. The rate law for this reaction can be given as
Rate=k[concentration of substrate][concentration of base]
Hence, greater the stability of carbanion intermediate faster will be reaction. Hence, both assertion and reason are correct.
E1cB reaction is a second-order and unimolecular reaction. The reaction proceeds in two steps. In the first step, the base abstracts an acidic hydrogen atom from the beta carbon atom to form the carbanion transition state, which is stabilized by resonance. In the second step, the lone pair of electrons on the anion moves to the neighbouring atom forming a pi bond with elimination of leaving group. The rate law for this reaction can be given as
Rate=k[concentration of substrate][concentration of base]
Hence, greater the stability of carbanion intermediate faster will be reaction. Hence, both assertion and reason are correct.
