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Type of reaction: Free radical substitution reaction. It is a monosubstitution reaction because there is only one hydrogen atom in alkane is substituted by halogen free radical. 

Step 1: Initiation step • In the present of uv light/heat, the covalent bond of Cl2 undergoes homolytic cleavage to produce free radicals. Function of uv light: provide energy for homolytic cleavage of Cl2

Step 2: Chain Propagation Step • Cl free radicals collide with methane to form HCl and methyl free radicals. Methyl free radicals react with Cl2 to form haloalkane and generate the chlorine free radicals

Step 3: Chain Termination Step • The reaction stops when the two free radicals collide and combine with one another

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