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- When an unsymmetrical Alkenes such as propane is treated with N-bromosuccinimide in aqueous dimethyl sulfoxide, the major product has the bromine atom bonded to the less highly substituted carbon atom. Is this Markovnikov or non-Markovnikov orientation? Show its complete reaction mechanism.Product Y is the major product of the reaction sequence below. Which product Y: *Find the major product and mechanism for the following two reactions.