A) \[B{{F}_{3}}\]
B) \[BC{{l}_{3}}\]
C) \[BB{{r}_{3}}\]
D) \[B{{I}_{3}}\]
Correct Answer: D
Solution :
The order of acid strength of Lewis acids, (i.e., boron trihalides) is as: \[B{{I}_{2}}>BB{{r}_{3}}>BC{{l}_{3}}>B{{F}_{3}}\]because the acid strength increases with increasing atomic size (or going down in periodic table.)
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