What is Lewis acid character order of Boron halides, arrange in increasing order?

The correct increasing order is BF₃ < BCl₃ < BBr₃ < BI₃ , this order of Lewis acidic character due to stronger 2pπ-2pπ back bonding in BF₃ (lone pair orbital of fluorine into vacant orbital of boron) and gradually back bonding becomes weakest in BI₃ (2pπ-5pπ) hence BF₃ has stronger partial double bond character and consequently behaves as less electron deficient

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