In $Group-13$ $(IIIA)$,$Tl$ (thallium) shows $+1$ oxidation state while other members show $+3$ oxidation state. Why?

  • A
    Presence of lone pair of electrons in $Tl$
  • B
    Inert pair effect
  • C
    Large ionic radius of $Tl$ ion
  • D
    None of these

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