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Q.

The stability of +1 oxidation state increases in the sequence:

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a

Tl

b

In

c

Ga

d

Al

answer is D.

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Detailed Solution

Due to the inert pair effect, group 1 3 elements show + I oxidation state also besides the group oxidation state +3, and the stability of lower oxidation state, i.e. +1, increases down the group (↓).
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