The series which consists of similar structures and similar chemical properties in which the successive compounds differs by a CH2 group is termed as homologous series.
The two characteristics of homologous series are as follows:
1. The members of the homologous series consists of same general formula such as Alkanes have general formula CnH2n+2
2. The two adjacent homologues have a difference of molecular mass of 14 u.
(i) All the members of a homologous series can be represented by the same-general formula.
(ii) The difference in the molecular mass of any two adjacent homologues is 14 u.
The general formula for the alkenes is: CnH2n
The first member of the series of alkenes is: Ethane which has formula CH4
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