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- 7. Propose a mechanism for the following reaction under conditions that favor a SN1 reaction. H,O HO Br5. The E1 and E2 elimination reactions of this substrate lead to two different alkene isomer products (E or Z). Propose a mechanism for the E1 and E2 reactions and predict which isomer is the major product of each. Explain why each mechanism yields a different product. H3C, H H Br H₂O E1 VS. NaOH E2 E CH3 or Z CH31. Which alkenes are formed from the following alkyl halide by an E1 reaction? Include all stereoisomers, and use the Zaitsev rule to predict the major product. E1 Major