Question

why reaction between methane and chlorine in the presence of sun light is called substitution reaction

Answer 1

If a mixture of methane and chlorine is exposed to a flame, it explodes - producing carbon and hydrogen chloride. This isn't a very usefulreaction! The reaction we are going to explore is a more gentle one between methane and chlorine in the presenceof ultraviolet light - typically sunlight..

I hope my answer is wright...