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The stability of +1 oxidation state increases in the sequence
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The correct answer is:
$\mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{Tl}$
Key Idea Stability of lower oxidation states increases on moving down a group due to inert pair effect.
The given elements belong to third group. These elements mainly exhibit +3 and +1 oxidation state. As we know the stability of lower oxidation state, $i e,+1$ state, increases on moving down a group, the sequence of stability is
$$
\mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{Tl}
$$
The given elements belong to third group. These elements mainly exhibit +3 and +1 oxidation state. As we know the stability of lower oxidation state, $i e,+1$ state, increases on moving down a group, the sequence of stability is
$$
\mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{Tl}
$$
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