Photochemical Bromination of an Alkane
Table of contents
Chemical Concepts Demonstrated
The pentene changes to colorless very quickly. The pentane changes after exposure to the overhead's light.
Explanation (including important chemical equations)
The light-catalyzed reaction between an alkane and bromine can be stated as follows:
Chain initiation: Br2 + hv --> 2 Br.
Chain propogation: Br. + R-H --> R-Br + H.
H. + Br2 --> H-Br + Br.
Chain termination: 2 Br. --> Br2
2 H. --> H2
H. + Br. --> HBr