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Q.

The relative stability of +3 oxidation state of group 13 elements follows the order.

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a

$A l < G a < T l < I n$

b

$A l < G a < I n < T l$

c

$T l < I n < G a < A l$

d

$I n < G a < T l < A l$

answer is B.

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Detailed Solution

In 13 group elements as we move down the group, stability of +3 state decreases due to inert pair effect.

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