A) \[B{{F}_{3}}<BC{{l}_{3}}<BB{{r}_{3}}<B{{I}_{3}}\]
B) \[B{{l}_{3}}<BB{{r}_{3}}<BC{{l}_{3}}<B{{F}_{3}}\]
C) \[BC{{l}_{3}}<BB{{r}_{3}}<B{{l}_{3}}<B{{F}_{3}}\]
D) \[BB{{r}_{3}}<BC{{l}_{3}}<B{{F}_{3}}<B{{I}_{3}}\]
E) \[B{{F}_{3}}<B{{I}_{3}}<BC{{I}_{3}}<BB{{r}_{3}}\]
Correct Answer: A
Solution :
Boron trihalides are Lewis acid. The order of their acidic strength is as: \[B{{F}_{3}}<BC{{l}_{3}}<BB{{r}_{3}}<B{{I}_{3}}\]
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