1.

The relative stability of +1 oxidation state of group 13 elements follows the order :(1)  Ga < Al < In < Tl(2)  Tl < Ln < Ga < Al(3)  Al < Ga < Tl < ln (4)  Al < Ga < ln < Tl

Answer»

Correct option  (4) Al < Ga < ln < Tl

Explanation:

As we move down the group (13th, 14th, 15th); (Max. oxidation state-2) becomes more stable due to inert pair effect. 



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