The correct order of stability of +1 oxidation state in the following
A
Ga < Tl < In
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B
Ga > In > Tl
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C
Ga < In < Tl
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D
Ga > Tl > In
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Solution
The correct option is C Ga < In < Tl As we move down in group 13, due to inert pair effect, the tendency to exhibit +3 oxidation state decreases and the tendency to attain +1 oxidation state increases.