Potential-energy versus reaction-coordinate diagrams for the two propagation steps for monobromination of methane should be sketched. Concept introduction: The mechanism for monobromination comprises of three stages illustrated as follows: Step1: Initiation via homolytic cleavage of Br − Br bond: Br 2 initiates the reaction; undergoes homolysis and forms bromine radical atom. Energy for homolytic cleavage is provided by the heat or ultraviolet light. Step2: Propagation: In first of the propagation step bromine radical from step 1 abstracts hydrogen radical from methane as follows: In subsequent propagation step methyl radical abstracts Br · radical from another Br 2 , and liberates bromoethane and new bromine radical. Step3: Termination: Radicals generated in propagation steps get quenched upon combination with one another. Thus termination steps are essentially the radical− radical combination illustrated as follows:

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Chapter 3, Problem 23P

Interpretation Introduction

Interpretation: Potential-energy versus reaction-coordinate diagrams for the two propagation steps for monobromination of methane should be sketched.

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

Step1: Initiation via homolytic cleavage of Br−Br bond: Br2 initiates the reaction; undergoes homolysis and forms bromine radical atom. Energy for homolytic cleavage is provided by the heat or ultraviolet light.

Step2: Propagation: In first of the propagation step bromine radical from step 1 abstracts hydrogen radical from methane as follows:

In subsequent propagation step methyl radical abstracts Br· radical from another Br2 , and liberates bromoethane and new bromine radical.

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

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