Substitution reaction can be defined as the reaction in which we substitute the functional group of one chemical compound by another group. Organic reactions are utilised in the production of new chemical compounds in organic synthesis. The basic chemical reactions in organic chemistry include redox reactions, rearrangement reactions, substitution reactions, addition reactions, photochemical reactions, elimination reactions, and pericyclic reactions. In this article, we will discuss the substitution reaction. It is a chemical reaction in which the replacement of atoms/groups of atoms takes place. Read on to learn more about its ... Learn what substitution reaction is and how it occurs in organic chemistry. Find out the difference between nucleophilic and electrophilic substitution reactions, and see examples of each type with mechanisms and conditions. Learn what a substitution reaction is with simple explanations, key types, and real-life examples for easy chemistry study.