# Explain The Substitution Reaction

Substitution reaction is defined as a chemical reaction during which an atom or group of atoms in a molecule is replaced or substituted by another atoms or group of atoms. An excellent example of a substitution reaction is halogenation.

Substitution reactions possess primary importance in the field of organic chemistry. These reactions are of two types.

1. Nucleophilic reaction
2. Electrophilic reactions

Substitution reaction is also called a single displacement reaction, single replacement reaction,

or single substitution reaction.

Example of Substitution reaction

The reaction of Chloromethane with the hydroxyl ion (OH-) will lead to the formation of the original molecule called methanol with that hydroxyl ion.

$$CH_{3}Cl + (OH^{-}) \rightarrow CH_{3}OH + Cl^{-}$$

Methanol

The reaction of Ethanol with the hydrogen iodide forms iodoethane along with water.

$$CH_{3}CH_{2}OH + HI → CH_{3}CH_{2}I + H_{2}O$$

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