Q.

Correct order of Lewis acid order for Boron halides is____?

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a

BF3>BCl3>B Br3>BI3

b

BF3

c

BI3>B Br3>BCl3>BF3

d

B Br3>BCl3>BI3>BF3

answer is C.

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Detailed Solution

As the Back bonding tendency decreases and Lewis acidic strength increases from BF3 to BI3. The pure p orbital of B in BF3 is not actually empty due to back donation from F atoms via sidewise overlapping.
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