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Assume That the Structure of BF3 (Boron Trifluoride, or Trifluoroborane)

Question 22

Essay

Assume that the structure of BF3 (boron trifluoride, or trifluoroborane) is correctly predicted by the VSEPR rules.
1. What is the predicted structure? (Show all unpaired valence electrons.)
2. The B-F bond is exceptionally strong. This suggests that it has some double-bond character. Draw resonance structures for BF3 that show that the three B-F bonds share some double-bond character. Be sure to show formal charges and all unshared electrons.
3. What is the polarity of the B-F bond? (In which direction is the bond dipole?) How do you know?

Correct Answer:

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1. Boron trifluoride consists of a centr...

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