In E1cB mechanism intermediate formed isa)Carbocationb)Carbanionc)Carbened)Carbon free radicalCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

E-1CB rxn have  carbanion intermediate .its a 2 step reaction like E-1 .But the basic difference is in e1cb rxb C-NU bond is strong like C-F. so leaving group cant leave; which leads to formation of carbanion.and in e1cb rxn there is formation of conjugate base which is rate determining step.hence rxn got its name Cb.

Answer

Option B;
The E1cB mechanism is just one of three types of elimination reaction. The other two elimination reactions are E1 and E2 reactions. ... In an E1mechanism, the molecule contains a good leaving group that departs before deprotonation of the α-carbon. This results in the formation of a carbocation intermediate.

Answer

Correct answer is option.b. carbanion

Answer

The first step in the E1cB mechanism is deprotonation (break C-H) to give a carbanion intermediate, and this step is promoted when there are electron-withdrawing groups adjacent to the alpha carbon (making the carbanion more stable).

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