A) \[B{{F}_{3}}\]
B) \[BC{{l}_{3}}\]
C) \[BB{{r}_{3}}\]
D) \[B{{I}_{3}}\]
Correct Answer: D
Solution :
The order of strength of Lewis acid character for boron halides is, \[B{{F}_{3}}<BC{{l}_{3}}<BB{{r}_{3}}<B{{I}_{3}}\] (due to back bonding)
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