MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic 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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