A) \[B{{I}_{3}}\]
B) \[~BB{{r}_{3}}\]
C) \[~B{{F}_{3}}\]
D) \[~BC{{l}_{3}}\]
Correct Answer: A
Solution :
Generally, higher the electronegativity, higher is the acidic strength. But in case of boron halides, back bonding takes place between B and F atoms, thus makes it less acidic. However, such a back bonding does not take place between B and I, so Bl3 has the highest Lewis acid strength among boron halides.
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