Question

A three-step mechanism has been suggested for the formation of carbonyl chloride:
Step 1: Cl2 ->2 Cl (fast, equilibrium)
Step 2: Cl + CO -> COCl (fast, equilibrium)
Step 3: COCl + Cl2 -> COCl2 + Cl (slow)
What is the molecularity of the rate-determining step?
A) unimolecular
B) bimolecular
C) termolecular
D) none of these

Answer

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