Question

Question 4.19 Arrange the bonds in order of increasing ionic character in the molecules: LiF, K2O, N2, SO2 and ClF3.

Class XI Chemical Bonding and Molecular Structure Page 130

Answer 1

ionic character is directly proportional to electronegativity difference between two different atoms in a molecule .

hence, the increasing order of ionic character are : N2 < SO2 <ClF3 < K2O < LiF.

[ Note :- higher the dipole moment , higher is the ionic character . in ClF3 has higher dipole moment than SO2. hence, ionic character in ClF3 is higher than in SO2 ]

Answer 2

Dipole moment helps in calculating the percentage ionic character of polar bonds.It is the ratio of observed dipole moment to the dipole moment for the complete transfer of electrons.Greater the difference in electronegativity of bonding atoms ,the greater will be the ionic character.

On this basis, the order of increasing ionic character in the given molecules is

N2 < SO2 < ClF3 < K2O < LiF.