Q.

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
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