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Correct order of Lewis acid order for Boron halides is

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By Expert Faculty of Sri Chaitanya
a
BF3>BCl3>BBr3>BI3
b
BCl3>BF3>BBr3>BI3
c
BI3>BBr3>BCl3>BF3
d
BBr3>BCl3>BI3>BF3
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detailed solution

Correct option is C

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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