Question
The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence
-
Ga<In< Al<Tl
-
Al<Ga<In<Tl
-
Tl<In<Ga<Al
-
In< Tl< Ga<Al
Solution
B.
Al<Ga<In<Tl
Al< Ga< In <Tl
This is due to inert pair effect or tendency of ns2 electrons do not participate in bond formation.
This tendency decreases on moving down the group.
