First slide

13th group or boron group

Question

The stability of +1 oxidation state increases in the sequence

Moderate

A

Tl< In< Ga < Al
B

In< TI< Ga<Al
C

Ga< In<Al< TI
D

Al< Ga < In < Tl

Solution

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence.
Al<Ga<In<Tl.
This is due to inert pair effect

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