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The stability of +1 oxidation state increases in the sequence:

1. Tl < In < Ga < Al < Bi
2. In < Tl < Ga < Al
3. Ga < In < Al < Tl
4. Al < Ga < In < Tl

Correct answer: Al < Ga < In < Tl

Solution

The stability of the +1 oxidation state increases down the group in group 13 elements due to the inert pair effect, which becomes more pronounced as we move down the group. Thus, Tl shows the most stable +1 oxidation state.

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