Question

Arrange the following in increasing order of their covalent character.

(A) CaF₂

(B) CaCl₂

(C) CaBr₂

(D) CaI₂

Choose the correct answer from the options given below.

Options

• B < A < C < D

• A < B < C < D

• A < B < D < C

• A < C < B < D

Answer 1

A < B < C < D

Explanation:

According to Fajan's rule,

Covalent character `∝` size of Anion

Because the cation is the same in all of the options. As a result, the covalent character will be determined by the size of the anion.

Covalent character: A < B < C < D;

Size of anion: F⁻ < Cl⁻ < Br⁻ < I⁻