Functional Groups & Homologous Series (Edexcel International A Level Chemistry)

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Functional Groups & Homologous Series

Homologous series

  • A homologous series is a group of organic compounds that have the same functional group, but each successive member differs by CH2

An Introduction to AS Level Organic Chemistry Ethanol and Propanol, downloadable AS & A Level Chemistry revision notes

Ethanol and propanol belong to the same homologous series

Homologous Series of Alkanes

  • Things we can say about a homologous series:
    • Each member has the same functional group
    • Each member has the same general formula
    • Each member has similar chemical properties
    • Each successive member differs by  -CH
    • Members have gradually changing physical properties, for example, boiling point, melting point and density
  • As a homologous series is ascended, the size of the molecule increases
  • This has an effect on the physical properties, such as boiling point and density

Functional Groups

  • Functional groups determine the physical and chemical properties of molecules
  • The table below shows a summary of common functional groups found in compounds
  • R is any other atom or group of atoms (except for hydrogen)

Functional Groups Found in Compounds Table

An Introduction to AS Level Organic Chemistry Functional Groups, downloadable AS & A Level Chemistry revision notes

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Sonny

Author: Sonny

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Sonny graduated from Imperial College London with a first-class degree in Biomedical Engineering. Turning from engineering to education, he has now been a science tutor working in the UK for several years. Sonny enjoys sharing his passion for science and producing engaging educational materials that help students reach their goals.