what is the difference between sn1 and sn2?
An Sn2 and Sn1 reaction mechanism. Sn2 reactions are bimolecular in rate of reaction and have a concerted mechanism. ... On the other hand, Sn1 reactions are unimolecular in rate of reaction and have a step-wise mechanism. This process first involves bond cleavage by the LG to generate a carbocation intermediate.