The following reaction in aqueous solution was found to be first order in [OH - ], first order in [C 2 H 5 Br], and inverse first order in Br - . C 2 H 5 Br + OH - $\rarr$C 2 H 5 OH + Br - Which one of the following mechanisms is consistent with the observed reaction order?

The rate law indicates that the rate depends only on the concentrations of the reactants raised to the first power, which suggests a first-order reaction. The proposed mechanism in choice A involves a fast step followed by a slow step, which is consistent with a first-order reaction. The other mechanisms either do not have a fast/slow step or do not have the appropriate reaction orders for the given concentrations.

The following reaction in aqueous solution was found to be first order in [OH - ], first order in [C 2 H 5 Br], and inverse first order in Br - . C 2 H 5 Br + OH - $\rarr$C 2 H 5 OH + Br - Which one of the following mechanisms is consistent with the observed reaction order?

The rate law indicates that the rate depends only on the concentrations of the reactants raised to the first power, which suggests a first-order reaction. The proposed mechanism in choice A involves a fast step followed by a slow step, which is consistent with a first-order reaction. The other mechanisms either do not have a fast/slow step or do not have the appropriate reaction orders for the given concentrations.

Solved

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

Question 87

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 $The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ C₂H₅⁺ + Br^-fast C₂H₅⁺ + OH^- $The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ C₂H₅OH slow
B) C₂H₅Br +H₂O $The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ C₂H₅OH + H⁺ + Br^-slow H⁺ + OH^-

$The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ H₂O fast
C) C₂H₅Br $The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ C₂H₅⁺ + Br^-slow C₂H₅⁺+ OH^-

$The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ C₂H₅OH fast
D) C₂H₅Br $The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ C₂H₅⁺ + Br^-slow OH^- + Br^- $The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ HOBr fast
HOBr + C₂H₅⁺ $The following reaction in aqueous solution was found to be first order in [OH-], first order in [C2H5Br], and inverse first order in Br-. C2H5Br + OH- \rarr C2H5OH + Br- Which one of the following mechanisms is consistent with the observed reaction order? A) C2H5Br C2H5+ + Br- fast C2H5+ + OH- C2H5OH slow B) C2H5Br +H2O C2H5OH + H+ + Br- slow H+ + OH- H2O fast C) C2H5Br C2H5+ + Br- slow C2H5+ + OH- C2H5OH fast D) C2H5Br C2H5+ + Br- slow OH- + Br- HOBr fast HOBr + C2H5+ C2H5OH + Br- fast$ C₂H₅OH + Br^-fast