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The relative stability of +1 oxidation state of elements of13th group follows the order

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AI > Ga > ln > Tl

AI < Ga < ln < Tl

AI = Ga > ln > Tl

AI = Ga < ln < Tl

answer is B.

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Detailed Solution

e.g., TlI is known compound while TlI₃ has not so far been prepared Inert pair effect.

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