Homologous series.

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 : C_nH_{2n + 2}