The stability of +1 oxidation state among $A l, G a, I n$ and $T I$ increases in the sequence :

T I < I n < G a < A l

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I n < T I < G a < A l

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G a < I n < A l < T I

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A l < G a < I n < T I

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Solution

The correct option is D $A l < G a < I n < T I$
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 $T I^{+} > I n^{+} > G a^{+} > A l^{+}$

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