# 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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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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Reaction Mechanism concept. If you need more Reaction Mechanism practice, you can also practice Reaction Mechanism practice problems.

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Based on our data, we think this problem is relevant for Professor Lalancette's class at NEWARK.