The following mechanism has been proposed for the gas-phase reaction of chlorofo

Question

The following mechanism has been proposed for the gas-phase reaction of chloroform (CHCl3) and chlorine:
1) Cl2 ? 2 Cl (fast, reversible)
2) Cl + CHCl3 ? HCl + CCl3 (slow)
3) Cl + CCl3 ? CCl4 (fast)
What rate law does this mechanism predict? Choose from the list below and enter the letters for all the terms needed in the rate law. (So for a rate law of k[Cl2] enter AD, and for a rate law of k[Cl2][CHCl3] enter ADF.)

A. k G. [HCl]1/2 M. [CHCl3]2 B. [CCl3] H. [Cl2]1/2 N. [CCl3]2 C. [HCl] I. [Cl]1/2 O. [HCl]2 D. [Cl2] J. [CHCl3]1/2 P. [Cl2]2 E. [Cl] K. [CCl3]1/2 F. [CHCl3] L. [Cl]2

Explanation / Answer

Slowest step of a reaction is RDS
i.e 2nd reaction is RDS
=k[HCl][CCl3]/[Cl][CHCl3]
=ACB/EF

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