Lesson : 4,11 ( What is called homlogous series ? Give any three of its Characteristics ? ) abswer for 10th in science
Answers
Answer:
DEFINATION
A homologous series is a series of hydrocarbons which have similar chemical properties and they share the same general formula. They are organic compounds having similar structure and functional groups. The constituents of the homologous series shoe a gradation in physical properties.
> Some examples of homologous series are:
- Alkane series having general formula CnH2n+2
CH4,C2H6,C3H8
Four characteristics of a homologous series are:
- They contain the same functional group throughout the series. Like a homologous series of alcohols will contain only OH groups.
- All the members of a homologous series can be represented by the same general formula, like the homologous series of alkanes can be represented by the same formula CnH2n+2, where n is an integer starting from 1.
- The members of a homologous series have the same chemical properties. This is because they contain the same functional group which determines the chemical properties of an organic compound.
- The members of the homologous series can be prepared by the same general method. They show a gradual increase in the values of physical properties.