Consider this three-step mechanism for a reaction:
Cl₂ (g) k₁⇌k₂ 2 Cl (g) Fast
Cl (g) + CHCl₃ (g) →k₃ HCl (g) + CCl₃ (g) Slow
Cl (g) + CCl₃ (g) →k₄ CCl₄ (g) Fast
c. What is the predicted rate law?

• A. Rate = k[Cl₂][CHCl₃]
• B. Rate = k[Cl][CHCl₃]
• C. Rate = k[Cl]²[CHCl₃]
• D. Rate = k[Cl₂]^1/2[CHCl₃]

Answer: (D)