X and Y react according to the equation \({\text{2X}} + {\text{Y}} \to {\text{Z}}\). The reaction can be described by the following mechanism:

\({\text{X}} + {\text{X}} \to {{\text{X}}_2}\)     slow

\({{\text{X}}_2} + {\text{Y}} \to {\text{Z}}\)     fast

What is the order of the reaction with respect to X and Y?

C