The Following Reaction in Aqueous Solution Was Found to Be $\rarr$

question 107

Multiple Choice

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^- $\rarr$ C₂H₅OH + Br^-
Which one of the following mechanisms is consistent with the observed reaction order?

• A)C₂H₅Br \(\rarr\) C₂H₅⁺ + Br^{- -} fast C₂H₅⁺ + OH^- \(\rarr\) C₂H₅OH slow
• B)C₂H₅Br +H₂O \(\rarr\)C₂H₅OH + H⁺ + Br^- slow H⁺ + OH^- \(\rarr\) H₂O fast
• C)C₂H₅Br \(\rarr\)C₂H₅⁺ + Br^- slow C₂H₅⁺ + OH^- \(\rarr\)C₂H₅OH fast
• D)C₂H₅Br \(\rarr\) C₂H₅⁺ + Br^- slow OH^- + Br^- \(\rarr\) HOBr fast
• HOBr + C₂H₅⁺ \(\rarr\) C₂H₅OH + Br^- fast

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