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

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

\({\mathrm{A}}_{2}\overset{{\mathrm{k}}_{1}}{\underset{{\mathrm{k}}_{-1}}{⇌}}\mathrm{A}+\mathrm{A}\text{ (fast) }\)

\(\mathrm{A}+{\mathrm{B}}_{2}\overset{{\mathrm{k}}_{2}}{\to }\mathrm{AB}+\mathrm{B}\text{ (slow) }\)

\(\mathrm{A}+\mathrm{B}\to \mathrm{AB}\text{ (fast) }\)

The overall order of the reaction is