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Question

BF3 has less lewis acidic property than BBr3 . Why ?

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Solution

The correct option is A 0
In BF3 due to back bonding means electron donation by fluorine to boron electron density increases in boron and hence its lewis acid character decreases.
As we move from fluorine to chlorine size of orbitals increases and hence there isn't much effective back bonding. Similarly BBr3 will have less back bonding due to much greater increases in size of overlapping orbitals.

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