Question

what is an homologous series

Answer 1

a series of compoundsin which the same functional group subsitutes for hydrogen in a carbon chain is called homologous series.
or
a series of compounds which differ by CH-2 group is called homologous series.
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Answer 2

Answer:

A homologous series is a sequence of compounds with the same functional group and similar chemical properties in which the members of the series can be branched or unbranched.

For example: Methane, Propane