The stability of +1 oxidation state among Al,Ga,In and TI increases in the sequence :
A
TI<In<Ga<Al
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B
In<TI<Ga<Al
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C
Ga<In<Al<TI
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D
Al<Ga<In<TI
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Solution
The correct option is DAl<Ga<In<TI Due to inert pair effect, the s orbital electrons will not be able to overlap effectively, thereby making +1 the more stable oxidation states as we go down the group.
∴ The stability order of the +1 ion is TI+>In+>Ga+>Al+