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Class 10
Chemistry :-NCERT Solution - Carbon And Its Compounds

Page No 78:
Question 6:

What is a homologous series? Explain with an example.


Answer:

A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group.

For example, methane, ethane, propane, butane, etc. are all part of the alkane homologous series. The general formula of this series is CnH2n+2.

Methane CH4

Ethane CH3CH3

Propane CH3CH2CH3

Butane CHCH2CH2CH3

It can be noticed that there is a difference of −CH2 unit between each successive compound.