Correct order of Lewis acid order for Boron halides is
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a
BF3>BCl3>BBr3>BI3
b
BCl3>BF3>BBr3>BI3
c
BI3>BBr3>BCl3>BF3
d
BBr3>BCl3>BI3>BF3
answer is C.
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Detailed Solution
Due to back bonding tendency in BF3 is more hence it is less Lewis acidBack bonding tendency decreases and Lewis acidic strength increases from BF3 to BI3