A) \[B{{I}_{3}}\]
B) \[BC{{l}_{3}}\]
C) \[B{{F}_{3}}\]
D) \[BB{{r}_{3}}\]
Correct Answer: A
Solution :
The relative Lewis acid character of boron trihalides is found to be in sequence of the following order. \[B{{I}_{3}}>BB{{r}_{3}}>BC{{l}_{3}}>B{{F}_{3}}.\] Hence, the correct option is [a].
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