Ans. Homologous series – organic compounds :
1.
Organic compounds
having same general molecular formula, similar structure with similar chemical
properties are placed together in the same series are called homolog and series
of such similar compounds is called homologous series.
2.
The formula of each homolog differs from the
member above or below it by one – CH2 group.
3.
The molecular mass of every two adjacent
members differ by 14. (C = 12; H = 1, – CH2 = 14)
For example homologous series of alkane : General formula : CnH2n
+ 2