Question

(a) Give one example of homologus series, give two properties of it. 

(b) What is the full form of IUPAC?

Answer 1

(a) Homologous series: When the members of a hydrocarbon family obey same general formula they are said to be in homologous series. 

The members in the series are arranged in increasing order of their molecular masses:

Example:

Alkane – C_nH_2n+2
CH₄ – Methane
C₂H₆ – Ethane
C₃H₈ – Propane
C₄H₁₀ – Butane

Properties:

1. The difference between two consecutive members of homologous series is of – CH₂ and mass 14 a.m.u.
2.  They all show same chemical properties and slight gradation in their physical properties.

(b) IUPAC: International Union of Pure and Applied Chemistry.