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- For each set of reactions, circle the mechanism (SN2 vs SN1), draw the main organic substitution/elimination product (for each reaction draw the product, though in some cases it may be equivalent) and indicate which reaction occurs at the faster rate.In the box to the left of each reaction below, write the mechanism by which it occurs (could be SN1, SN2, or E1, or even 2 of them). Then draw the product(s).How does each of the tripling [RX] changes affect the rate of an E2 reaction?