BF3
is weaker lewis acid as compared to BCl3
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In boron halides, there exists certain degree of pi bonding involving halogen lone pairs and empty 2p orbital of boron.This bonding is strongest in case of BF3 and when a boron halide accepts electrons from a donor molecule, this bonding is lost. Due to this, BF3 resists this change most strongly followed by other halide.
Due to this, BCl2 stronger Lewis acid than BF3
Due to this, BCl2 stronger Lewis acid than BF3
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