Suppose the experimental rate law for the reaction in Practice Problem 13.24 is: Rate = k[Y₂]²

Use the step postulated in Practice Problem 13.24 as the first step in a possibly correct mechanism for the reaction. Don’t be afraid to be creative with your steps, but keep your collisions to two molecules. In addition, 

(a) Show that the steps of your proposed mechanism add to give the proper overall reaction.

(b) Circle all reaction intermediates.

(c) What might you do to prove this mechanism beyond a reasonable doubt?

Data from Problem 13.24

Suppose the experimental rate law for the reaction X₂ + Y₂ → 2 XY is: Rate = k[X₂][Y₂] A student postulates a multistep mechanism in which the first step is the rate-determining step. For this step, he postulates 2Y₂ → Y₃ + Y. Is it possible for this to be the rate-determining step?