4.3 know what is meant by the term homologous series, functional group and isomerism

Homologous series- 
A series of organic compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group, and shows a gradation in physical properties as a result of increase in molecular size and mass.

Functional group -
A group of atoms responsible for the characteristic reactions of a particular compound.

Isomerism - 
Two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.

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