The reaction \({A}_{2}+{B}_{2}\to 2AB\) follows the mechanism \({A}_{2}\overset{{k}_{1}}{\underset{{k}_{-1}}{⇌}}A+A\text…

The reaction \({A}_{2}+{B}_{2}\to 2AB\) follows the mechanism

\({A}_{2}\overset{{k}_{1}}{\underset{{k}_{-1}}{⇌}}A+A\text{ (fast) }\\ A+{B}_{2}\overset{{k}_{2}}{\to }AB+B\text{ (slow) }\\ A+B\to AB\text{ (fast) }\)

The overall order of the reaction is