Which of the two compounds listed will give a faster SN² reaction with OH^- and why?

a)CH₂=CHBr

b)CH₂=CH-CH₂Br

Dear student,

SN2 reaction depends on carbocation stabilty and hence compund b) shows SN2 reaction with OH-...

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

SN¹ reaction of a) will give carbocation which is unstable because +ve charge is at doubly bonded carbon...

but SN¹ reaction of b) will give carbocation which is stable due to resonance ....

therefore a) will give SN² faster & b) will give SN¹ faster.......

hi Aparna ,

                  my ans is a);bcoz sn2 mechanism follows pri &sec alkylhalides & it is favoured bysmall group on the carbon atom attached to halogen . if my ans is wrong then plz tell me the correct ans .  thanks dear !!!!!!!!! i will wait ..........