The series of organic compounds in which the consecutive member differs by CH2 group is called homologous series. Examples:
C4 H10: Butane
Properties of homologous series:
- Consecutive members differ by CH2 units.
- All the members of homologous series have similar properties.
- Physical properties of homologous series gradually changes with the change in molecular weight.
- All the members of homologous series can be represented by a common general formula. Example: Alkanes can be represented by the general formula. CnH2n+2, where n is the number of carbon atom.
- Two consecutive homologues differs by 14 units in molecular weight.