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


















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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 ..........