question_answer

The highest electrical conductivity of the following aqueous solutions is of     AIEEE  Solved  Paper-2005

A) 0.1 M difluoroacetic acid

B) 0.1 M fluoroacetic acid

C) 0.1 M chloroacetic acid

D) 0.1 M acetic acid

Correct Answer: A

Solution :

Conduction of electric charge depends on the ions. Higher the number of ions higher the electrical conductivity. So, find the acid which gives stable ions in solution. Fluoro group causes negative inductive effect increasing ionisation, thus 0.1 M difluoroacetic acid has highest electrical conductivity.