Question

what is homologous series? ​

Answer 1

In the field of organic chemistry, a homologous series is a sequence of compounds with the same functional group and similar chemical properties in which the members of the series can be branched or unbranched. ☺

Answer 2

A N S W E R :

$\underline{\mathcal{\red{HOMOLOGOUS\:\:SERIES\::}}}$

When the general formula and functional groups are same for the organic compound & these can be settle with a molecular weight difference of 14, then a series is formed called homologous series. Each compound of the homologous series is known as homologue of each other.

$\underline{\mathcal{\red{HYDROCARBON\:\:SERIES\::}}}$

General formula for homologous series of saturated hydrocarbons is $\bf{C_nH_{2n+2}}$ .

Example :

$\bullet\tt{n = 1 , CH_4 \:(methane)}$

$\bullet\tt{n = 2 , C_2H_6 \:(ethane)}$

$\bullet\tt{n = 3 , C_3H_8\:(propane)}$

$\bullet\tt{n = 4 , C_4H_{10}\:(butane)}$

$\bullet\tt{n = 5 , C_5H_{12}\:(pentane)}$

Methane, ethane, propane, butane, pentane, etc., are called homologue of each other.

General formula for homologous series of unsaturated hydrocarbons, alkene is $\bf{C_nH_{2n}}$ .

Example :

$\bullet\tt{C_2H_4 \:\: =(ethene) }$

C3H6 = (propene) .