Which compound will react faster to SN2 reaction with OH- --- CH2=CHBr or CH2=CH-CH2Br ?

Vinyl halides generally donot undergo either SN1 or SN2 reactions. In case of SN2 reactions, the backside attack of nucleophile is repelled by the electrons present in the double bond.

On the other hand, allylic halides undergo SN2 reaction easily due to formation of resonance stabilised transition state through conjugation with the p orbitals of the pi bond. 

Thus, CH2=CH-CH2Br  will react faster with the nucleophile (OH-) by SN2 mechanism.

  • 6
What are you looking for?