Arrange the boron trihalides ( $$BF_3$$ , $$BCl_3$$ , $$BBr_3$$ , $$BI_3$$ ) in increasing order of Lewis acidic strength.

Question

Arrange the boron trihalides ( $$BF_3$$  ,  $$BCl_3$$  ,  $$BBr_3$$  ,  $$BI_3$$  ) in increasing order of Lewis acidic strength.

Canvas Classes · Accepted Answer

Order:  $$BF_3 < BCl_3 < BBr_3 < BI_3$$    Note: This is contrary to the expected trend based purely on electronegativity (where  $$BF_3$$   would be expected to be strongest).

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