3.5 describe the substitution reaction of methane with bromine to form bromomethane in the presence of UV light

In the presence if UV light, halogens will react with alkanes (producing haloalkanes). When this reaction occurs, a hydrocarbon atom from the alkane is replaced by the halogen (chlorine or bromine). This is known as a substitution reaction...



methane + bromine ---> bromomethane + Hydrogen bromine

NOTE: The reaction must have UV light to work, just like photosynthesis can't work without light, substitution reactions will not work without UV light.