Question

The maximum covalent character is seen in which of the following compounds?

• A. $B_2{O}_3$
• B. $BeO$
• C. $CsF$
• D. $L{i}_2$

Answer 1

The correct option is A $B_2{O}_3$

As the charge on the cation increases, the covalent character also increases.
According to Fajans rule, cation with greater charge and smaller size favours covalency.
Boron has the highest $Z_{eff}$ and higher positive charge and smaller size among the given compounds.
So, $B_2{O}_3$ has the maximum covalent character.