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

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A l < G a < T l < I n

T l < I n < G a < A l

G a < A l < I n < T l

A l < G a < I n < T l

answer is D.

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Detailed Solution

Due to inert pair effect ‘+ 1 ‘oxidation stability increases from $A l$ and $T l$

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