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The order of Lewis acidity of boron halides is

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The order of Lewis acidity is

BI3>BBr3>BCl3>BF3

The electronic configuration of boron  1s22s22p1. Boron halide BX3 is electron deficient as it's octet is not satisfied. This makes it a Lewis acid. 

In boron halides the dative pi bond (back bonding) occurs between p-orbital carrying lone pair of electrond of halogen atom and vacant p-orbital of central B- atom. With increase in size of Halogen stom this overlap decreases due to larger size of p- orbitals. This phenomenon makes boron halide more electron deficient with increase in size of Halogen atom. So the above noted trend of Lewis acid is found.


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