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Q.

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.
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