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Which amongst the following is not a characteristic of the homologous series?


Options:
A .   The members of a homologous series can be represented by a general formula.
B .   Successive members of a homologous series differ by a CH3 group.
C .   The members of a homologous series show a similarity in chemical properties.
D .   The physical properties in the series of compounds have a regular gradation.
Answer: Option B
:
B
The characteristics of homologous series are:
(1) The members can be represented by the same general formula. For example, CnH2n for alkenes.

(2) Successive member differs by a CH2 group and not by a CH3 group.


(3) Members show similarity in chemical properties.


(4) There is a regular gradation in physical properties. For example, in alkanes as 'n' value increases, their boiling point increases. 



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