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The reaction of formation of phosghene from CO\ce{CO}CO and ClX2\ce{Cl2}ClX2 is CO+ClX2→COClX2\ce{CO}+\ce{Cl2}\rightarrow \ce{COCl2}CO+ClX2→COClX2. The proposed mechanism is as follows:
(i) ClX2→K1←K−12 Cl(fast)\text{(i) }\ce{Cl2}\xrightarrow [ K_{ 1 } ]{ \xleftarrow { K_{-1} } } \ce{2Cl}\quad(\text{fast})(i) ClX2K−1K12Cl(fast)
(ii) Cl+CO→K2←K−2COCl(fast)\text{(ii) }\ce{Cl}+\ce{CO}\xrightarrow [ K_{ 2 } ]{ \xleftarrow { K_{-2} } } \ce{COCl}\quad(\text{fast})(ii) Cl+COK−2K2COCl(fast)
(iii) COCl+ClX2→K3COClX2+Cl(slow)\text{(iii) }\ce{COCl}+\ce{Cl2}\xrightarrow { { K }_{ 3 } } \ce{COCl2}+\ce{Cl}\quad(\text{slow})(iii) COCl+ClX2K3COClX2+Cl(slow)
What is the order of reaction?
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