A) \[BC{{l}_{3}}\]
B) \[GaC{{l}_{3}}\]
C) \[\ln C{{l}_{3}}\]
D) \[TIC{{l}_{3}}\]
Correct Answer: D
Solution :
B, Al, Ga, In and Tl are placed in group 13 in long form of periodic table. All these elements form \[M{{X}_{3}}\] type halides. On moving down the group, the inert pair effect becomes more and more pronounced therefore, in Tl, + 1 oxidation state is more stable than + 3 oxidation state. Due to which, it is least stable.
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