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\[B{{I}_{3}}\]has the highest Lewis acid strength among boron halides.
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