A) \[Tl(III)\]iodide
B) \[\ln (III)\]bromide
C) \[Ga(III)\]fluoride
D) \[B(III)\]chloride
Correct Answer: A
Solution :
In Boron family from \[B\] to \[Tl\], the tendency of \[s-\]electrons of the valence shell to participate in bond formation decreases. This reluctance of the \[s-\]electrons to participate in bond formation is called inert pair effect. Thus, down the group, \[+1\] oxidation state becomes more and more stable as compared to \[+3\] oxidation state. This is the reason that \[Tl(III)\] iodide is not known.
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