Question

what is meant by homologus 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 unit or 14 amu.

Answer 2

 A Homologous Series is a group of organic chemical compounds, usually listed in order of increasing size, that have a similar structure and hence also similar properties and whose structures differ only by the number of CH2 units in the main carbon chain.