The relative stability of +1 oxidation state of group 13 elements follows the order :
Show Hint
- \(\mathrm{Tl} \lt \mathrm{In} \lt \mathrm{Ga} \lt \mathrm{Al}\)
- \(\mathrm{Al} \lt \mathrm{Ga} \lt \mathrm{Tl} \lt \mathrm{In}\)
- \(\mathrm{Al} \lt \mathrm{Ga} \lt \mathrm{In} \lt \mathrm{Tl}\)
- \(\mathrm{Ga} \lt \mathrm{Al} \lt \mathrm{In} \lt \mathrm{Tl}\)
The Correct Option is C
Solution and Explanation
Down the group, the inert pair effect increases because poorly shielding d and f electrons make the ns2 pair more strongly held and less available for bonding.
So the stability of +1 increases down the group: Al < Ga < In < Tl (Tl(I) is more stable than Tl(III)).
Answer: (3) Al < Ga < In < Tl
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