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Question:

The relative stability of +1 oxidation state of group 13 elements follows the order:

Ga<Al<In<Tl

Al<Ga<Tl<In

Al<Ga<In<Tl

Tl<In<Ga<Al

Solution:

Due to the inert pair effect as we move down the group in 13th group lower oxidation state become more stable. So, the correct order is: Al<Ga<In<Tl.