Question:medium
The order of acidity of boron trihalides is:
The order of acidity of boron trihalides is:
Show Hint
Think about pi back bonding between the halogen lone pair and boron's empty 2p orbital, not just electronegativity.
Updated On: Jul 3, 2026
- BF3 > BCl3 > BBr3
- BBr3 > BCl3 > BF3
- BF3 > BBr3 > BCl3
- BBr3 > BF3 > BCl3
Show Solution
The Correct Option is B
Solution and Explanation
Method: reorganization energy. Strong back bonding in BF3 stabilizes the planar form, so pyramidalizing on adduct formation costs more energy, disfavoring reaction with a base. BBr3 has weakest back bonding, so pyramidalization costs least, favoring reaction.
\[\boxed{\text{BBr}_3 > \text{BCl}_3 > \text{BF}_3}\]Was this answer helpful?
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