Question

Define homologous series. Give an example.

Answer 1

A homologous series is a group or family of structurally similar organic compounds that share the same functional group, exhibit similar chemical characteristics, and show a regular gradation in physical properties. Each successive member of the series differs from the preceding one by a -CH₂- group or a molecular mass of 14 amu.

Example (Alkanes series): Methane (CH₄), Ethane (C₂H₆), Propane (C₃H₈).