Stability of trivalent and mono valent cation of group 13 (Boron family) will be in order :

Options

A. `Ga^(3+)ltIn^(3+)ltTI^(3+)`
B. `Ga^(3+)gtIn^(3+)gtTI^(3+)`
C. `Ga^(+)gtIn^(+)ltTI^(+)`
D. `Ga^(+)ltIn^(+)ltTI^(+)`

Answer

B,D

Explanation

By inert pair effect stability of `+3` state decreases and that of `+1` state increases along a group.