Can I get somebody to explain SN1 vs SN2 reactions in terms of both what happens and how the rate law applies? Thank you
SN1: it represents nucleophillic unimolecular substitution.
it happen through 2 steps.
step:1 R-X ------------> R+ + X- formation of carbocation intermediate slow step
step 2: R+ + Nu --------------> R-Nu reacting intermediate with Nu fast step.
as we know rate of multi step reaction depends on the step which occuer slowly.
in above case in slow step only alkyl halide present. so rate law as follows
rate = K [R-X]
so it if first order kinetics.
SN2) nucleophillic bimolecular substitution
R-X + Nu --------------> R-Nu + X- it is one step reaction
rate is depends on both alkyl halide and nucleophile
rate = K[R-X][Nu]
it follows second order kinetics
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