In an ionic compound `A^(+) X^(-)` the degree of covalent bonding is greatest when

Options

A. ` A^(+) " and x^(-)` ions are small
B. `A^(+) ` is small and `X^(-)` is large
C. `A^(+)" and "X^(-) ` ions are approximately of the same size
D. ` X^(-) ` is small and ` A^(+)` is large .

Answer

b

Explanation

According to Fajan rule , polarization and hence
covalent bonding is maximum when ` A^(+)` is small and `x^(-)` is large .