Reaction 1 has a rate constant whose units are M−2s−1, whereas Reaction 2 has a rate constant whose units are s−1. Which of the following best compares the overall reaction orders?
a) Reaction 1 is second-order overall, and Reaction 2 is zero-order overall.
b) Reaction 1 is third-order overall, and Reaction 2 is zero-order overall.
c) Reaction 1 is third-order overall, and Reaction 2 is first-order overall.
d) Reaction 1 is second-order overall, and Reaction 2 is first-order overall.