Organic Chemistry: Intro to Organic 4

Problem :

The above reaction has the following rate law:

If [C₂H₅O^-] is tripled while [CH₃Br] is constant, the rate of the reaction also triples. If [CH₃Br] is doubled while [C₂H₅O^-] is constant, the rate of the reaction is also doubled. What are the values of a and b? What is the overall reaction order?

Problem : Which one of the following steps is rate-limiting?

Problem : Sketch the reaction coordinate vs. energy for the reaction given in the previous problem.