Chapter 20, Problem 69E

The reaction ${\text{2NO+Cl}}_{\text{2}}\to 2\text{NOCl}$ has rate law: rate of reaction= $K{\left[\text{NO}\right]}^2\left[{\text{Cl}}_{\text{2}}\right]$ . Propose a twostep mechanism for this reaction consisting of a fast reversible first step, followed by a slow step.