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Which of the following statements correctly describe SN2 and SN1 reactions?
I.SN2 reactions proceed with retention of configuration.
II.SN1 reactions prefer polar protic solvents.
III.SN1 reactions can produce racemic products.
IV.SN2 reactions are promoted in the presence of a substrate that produces a very stable carbocation.
V.SN1 reactions have a unimolecular rate-determining step.
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