What are substitution reactions? Justify your answer with a suitable example.
A chemical reaction in which atom(s) or group of atoms of an organic compound is/are replaced by other atom(s) or group of atoms without any change in the rest of the molecule is called a substitution reaction. For example, CH4 + Cl2 → CH3Cl + HCl In this chemical reaction Cl atom substitutes one hydrogen atom from methane.