The correct order of stability of +1 oxidation state of Group-13- elements follows
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a
Al < Ga
b
Tl < In < Ga < Al
c
Al < Ga < In < Tl
d
Ga < Al < In < Tl
answer is C.
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Detailed Solution
The common oxidation states of Group-13-elements are +3 and +1Down the group ‘+1’ oxidation state of elements Gradually increasesFor example, ‘+1’ oxidation state of Thallium is more stable than ‘+3’ oxidation state it is due to inert pair effect.