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.
The general formula for the alkenes is: CnH2n. The members of the series of alkenes is :
1st member is C2H6 (Ethene)
2nd member is C3H9 (Propene)
(i) The number of carbon atoms decides the physical properties. Increase in Carbon atoms in the homologus series results in increase in the melting points, boiling points and density.
(ii) The compounds of homologues series have same chemical properties due to same basic structure of members of homologus series.
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