A Three-Step Mechanism Has Been Suggested for the Formation of Carbonyl

question 178

Multiple Choice

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

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