Problem: 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? 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 

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Problem Details

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?

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 

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