State the characteristics of a homologous series.

Explanation

Characteristics of homologous series :
i. The general molecular formula of all the compounds in the series is the same.
ii. All the members have the same functional group.
iii. Consecutive mebers of the series differ from one another by `-CH_(2)-` unit (methylene group), and their molecular mass differs by 14 u.
iv. Physical properties like melting point, boiling point, density, etc., generally show a gradual change with increase in molecular mass in the series.
v. Chemical properties of the members of the series show similarity because of the presence of the same functional group in them.