In III A group ,Tl (Thalium) shows stable +1 oxidation state, while boron shows stable +3 oxidation state. It is due to
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For TL, after the removal of one electron from p-orbital , the remaining 6s2 electrons behave like stable noble gas and do not take part in compound formation.
This reluctance of the s-electron pair to take part in chemical combination is called inert pair effect.
So +1 oxidation state more stable for Tl
Due to the absence of inert pair effect B does not show +1 oxidation state.
Hence b is the correct answer.
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