Class 10 Chemistry Carbon and Its Compounds Homologous Series

Homologous Series

  • A series of carbon compounds in which same functional group substitutes the hydrogen atom is called a homologous series.
  • These compounds have similar chemical properties due to the addition of same kind of functional group throughout the chain.
  • For example, the series of alkanes i.e. Methane, ethane, propane, butane and so on is a homologous series.

  • Similarly the series of alkene and alkynes also forms homologous series.

Homologous series of alkenes are as follows:

Homologous series of alkynes are as follows:

  • The series like methanol, ethanol, propanol, butanol and so on is also a homologous series. The functional group attached to these compounds is alcohol.

  • With the increase in molecular mass in a homologous series the physical properties like melting points, boiling points and solubility in a particular solvent increases.
  • But the chemical properties of a homologous series determined by the functional group remain same.

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