Question

Define homologous series?

Answer 1

Homologous series:

• A homologous series is a collection of compounds with the same general formula that differ only in the carbon chain length.
• Compounds in a homologous series often have a fixed set of functional groups, resulting in chemical and physical properties that are comparable.
• For example, homologous series of alkane: CH₄, C₂H₆, C₃H₈, etc. are homologous.
• They differ from each other by -CH₂ unit.

The characteristics of homologous series:

• The functional group of the members of the homologous series is the same.
• The general formula is the same for all members.
• Members of homologous series have nearly identical chemical properties due to the same functional group.
• Members of homologous series have a general method of preparation in common.