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Substitution reactions are divided into three general classes, depending on the type of atom or group that acts as the substituent. In one, the substituent is electron-rich and provides the electron pair for bonding with the substrate (the molecule being transformed). This type of reaction is known as nucleophilic substitution. Examples of nucleophilic reagents are the halogen anions (Cl -, Br -, I -), ammonia (NH 3), the hydroxyl group, the alkoxy group (RO −), the cyano group, and the ... 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 ... Substitution reaction can be defined as the reaction in which we substitute the functional group of one chemical compound by another group. A substitution reaction is any chemical process that replaces one atom, ion, or group in a molecule with another.