MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic Chemistryp-Block (group 13 and 14)Boron and Its Compounds

The power of halides of boron to act as Lewis acids decreases in the order:

A.BF₃ > BCl₃ > BBr₃

B.BBr₃ > BCl₃ > BF₃✓ Correct

C.BCl₃ > BF₃ > BBr₃

D.BCl₃ > BBr₃ > BF₃

Explanation

Lewis acid is a compound that has a vacant orbital to accept a lone pair of electrons. The acidic character of Boron halides increases down the group as back bonding ability of halides decreases down the group. Therefore, the order of acidic character of boron ha- lides is 3 3 3 BBr BCl BF > >

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