The following reaction in aqueous solution was found to be first order in [OH^-], first order in [C₂H₅Br], and inverse first order in Br^-.
C₂H₅Br + OH^-  C₂H₅OH + Br^-
Which one of the following mechanisms is consistent with the observed reaction order?

Question

Quizplus · Accepted Answer

The rate law indicates that the reaction is first order in [OH^-], first order in [C₂H₅Br], and inverse first order in Br^-. This suggests that the rate-determining step involves the collision of a Br^- molecule with the C₂H₅Br molecule. The reaction involves two species, and the rate of the reaction is determined by the collision of these two species. The proposed mechanism in option A satisfies the rate law and is consistent with the observed reaction order. It involves a fast equilibrium step to form an intermediate, followed by a slow step to form the products.

The Following Reaction in Aqueous Solution Was Found to Be