Homologous Series

Homologous Series:

  In organic chemistry , homologous series is defined as a series of compounds in which there is a constant difference of methylene (-CH2-) group between any two successive members of the family.


General characteristics of Homologous Series:

  1. There is a constant difference of methylene (-CH2-) group between any two successive members of a homologous series.
  2. All the members of a homologous series can be represented by a general formula e.g. general formulae for alkanes, alkenes, alkynes, alcohols, alkyl halides are CnH2n+2, CnH2n, CnH2n-2, CnH2n+1OH, CnH2n+1X respectively.
  3. All the members of a homologous series have same functional group.
  4. All the members of a homologous series have same general chemical properties.
  5. There is a gradual change in physical properties in a homologous series from lower members to higher members.
  6. All the members of a homologous series can be prepared by same general methods of preparations.
  7. All families of organic compounds form a homologous series.

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