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 à 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?