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The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence:

1. (a) Ga < In < Al < Tl
2. (b) Al < Ga < In < Tl
3. (c) Tl < In < Ga < Al
4. (d) In < Tl < Ga < Al

Correct answer: (b) Al < Ga < In < Tl

Solution

The stability of the +1 oxidation state increases down the group due to the inert pair effect, which becomes more pronounced in heavier elements like Tl.

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