A reasonable rate expression corresponding to chlorination of methane reaction should be proposed. Concept introduction: The mechanism for monochlorination comprises of three stages illustrated as follows: Step 1- Initiation via homolytic cleavage of Cl − Cl bond: Cl 2 initiates the reaction; undergoes homolysis to yield chlorine radicals. Energy for homolytic cleavage is provided by the heat or ultraviolet light. Step 2: Propagation: In the first of the propagation steps Cl · radical generated from step 1 abstracts hydrogen radical from methane as follows: In subsequent propagation step chloromethyl radical abstracts Cl · radical from another Cl 2 , and liberates dichloromethane and new Cl · radical. Step3: Termination: Radicals generated in propagation steps get quenched upon the combination with one another. Thus termination steps are essentially the radical− radical combination illustrated as follows:

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Chapter 7, Problem 40P

Interpretation Introduction

Interpretation:A reasonable rate expression corresponding to chlorination of methane reaction should be proposed.

Concept introduction:The mechanism for monochlorination comprises of three stages illustrated as follows:

Step 1- Initiation via homolytic cleavage of Cl−Cl bond: Cl2 initiates the reaction; undergoes homolysis to yield chlorine radicals. Energy for homolytic cleavage is provided by the heat or ultraviolet light.

Step 2: Propagation: In the first of the propagation steps Cl·

radical generated from step 1 abstracts hydrogen radical from methane as follows:

In subsequent propagation step chloromethyl radical abstracts Cl· radical from another Cl2 , and liberates dichloromethane and new Cl· radical.

Step3: Termination: Radicals generated in propagation steps get quenched upon the combination with one another. Thus termination steps are essentially the radical− radical combination illustrated as follows:

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