CHM 2046C Module Nine Sample Exam


Part C: Free Radical Mechanism Example 10 points


The free radical mechanism for the halogenation of alkane has been established as a chain reaction. Demonstrate this mechanism by showing all four steps in this mechanism using Methane and Bromine in Ultraviolet Light


CH4 + Br2 + uv light CH3Br + HBr


a.   Chain initiation step:





b.   Chain Propogation Steps











c.   Chain Termination Steps:











d. What evidences did the chemist record which lead to this suggested mechanism?