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This looks at the mechanism of the reaction of bromoethane with ammonia. Known as SN2 for short, this stands for substitution nucleophilic second order. Bromoethane is a primary haloalkane. They undergo SN2 reactions with the :NH3 nucleophile. In SN2 both the haloalkane molecule and :NH3 nucleophile are involved in the slow rate-determining step. It is known as a bimolecular reaction, where is where the 2 comes from in SN2.