Question

define homologous series?

Answer 1

It is defined as the series of similarly constituted compounds in which the members possess same functional group and has similar chemical characteristics and the two consecutive members differ in their molecular formula by -CH2 group.

Answer 2

$\bold{ \underline{ HOMOLOGOUS \: SERIES :-}}$

➡A series of organic compounds in which the same functional group substitute for hydrogen in a carbon Chain is called homologous series.

➡CHARACTERISTICS OF HOMOLOGOUS SERIES :-

❇All the members of homologous series have same functional group.

❇All the members of homologous series have same general formula.

❇The change in properties of homologous series is because of Change in size of a alkyle group.

❇Each successive member in homologous series differ by molecular formula ( CH2).

❇Any two successive member differ by molecular mass 14u.

❇ Physical properties like melting point, boiling point, solubility in particular solvent also show gradation in homologous series . These are determine by Carbon Chain end.

❇ Chemical properties are determine by functional group.