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The p-Block Elements
Question
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The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence

  • Ga<In< Al<Tl

  • Al<Ga<In<Tl

  • Tl<In<Ga<Al

  • In< Tl< Ga<Al

Answer

B.

Al<Ga<In<Tl

Al< Ga< In <Tl
This is due to inert pair effect or tendency of ns2 electrons do not participate in bond formation.
This tendency decreases on moving down the group.

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