A) \[Al<Ga<In<Tl\]
B) \[Tl<In<Ga<Al\]
C) \[In<Tl<Ga<Al\]
D) \[Ga<In<Al<Tl\]
Correct Answer: A
Solution :
[a] Key Idea Stability of lower oxidation states increases on moving down a group due to inert pair effect. The given elements belong to third group. These elements mainly exhibit +3 and -H oxidation state. As we know the stability of lower oxidation state, ie, +1 state, increases on moving down a group, the sequence of stability is Al < Ga < In < Tl
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