Functional group

• It is an atom or group of atoms which is present in a homologous series and it determines the chemical properties of that homologous series.

• Functional group gives the chemical characteristics of each Homologous series.

• Homologous series have same functional group and hence have same chemical behavior.

• Functional group is responsible for many chemical reactions of a homologous series.

For example: Alkenes have C=C as functional group, Alcohols have –OH as functional group etc.

Alkenes have C=C bonds as functional groups and Alcohols have -OH as functional groups.                                                 But alkanes have no functional  group.