Question

Compare the acidic strength of BBr3 and BCl3.

Answer 1

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Boron atom in boron halides, ie BX3, has six electrons in the outermost orbit and thus it can accept a pair of electrons form a donor molecule like NH3 to complete its octet. Hence Acid character of boron trihalides is found to obey the order ; BI3>BBr3>BCl3>BF3. ... Thus, lewis acidity increases as BF3<BCl3<BBr3<BI3

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