Chemical Kinetics Problem Seen Before

Chemistry Level 3

The reaction of formation of phosghene from CO\ce{CO} and ClX2\ce{Cl2} is CO+ClX2COClX2\ce{CO}+\ce{Cl2}\rightarrow \ce{COCl2}. The proposed mechanism is as follows:

(i) ClX2K1K12Cl(fast)\text{(i) }\ce{Cl2}\xrightarrow [ K_{ 1 } ]{ \xleftarrow { K_{-1} } } \ce{2Cl}\quad(\text{fast})

(ii) Cl+COK2K2COCl(fast)\text{(ii) }\ce{Cl}+\ce{CO}\xrightarrow [ K_{ 2 } ]{ \xleftarrow { K_{-2} } } \ce{COCl}\quad(\text{fast})

(iii) COCl+ClX2K3COClX2+Cl(slow)\text{(iii) }\ce{COCl}+\ce{Cl2}\xrightarrow { { K }_{ 3 } } \ce{COCl2}+\ce{Cl}\quad(\text{slow})

What is the order of reaction?

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