The relative stability of


The relative stability of $+1$ oxidation state of group 13 elements follows the order :-

  1. $\mathrm{Al}<\mathrm{Ga}<\mathrm{Tl}<\mathrm{In}$

  2. $\mathrm{Tl}<\mathrm{In}<\mathrm{Ga}<\mathrm{Al}$

  3. $\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$

  4. $\mathrm{Ga}<\mathrm{Al}<\mathrm{In}<\mathrm{Tl}$

Correct Option: , 3


Due to inert pair effect as we move down the group in $13^{\text {th }}$ group lower oxidation state becomes more stable.

$\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{T} \ell$

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