Chapter 4: Carbon and Its Compounds

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Carbon and Its Compound


What is a homologous series? Explain with an example.


The homologous series is defined as the compound which has the same general formula but varies by the length of the carbon chain. The members of the homologous series have the same general formula but they differ by -CH2 unit. All the compounds in the homologous series have similar chemical properties but different physical properties and the gradual change in their physical properties increases with an increase in molecular mass.

For example, methane (CH­4), ethane (C2H6), and propane (C3H8) form homologous series of an alkane.

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