why BF3 do not have π bonds
Answers
Answer:
In one structure, the
B atom has 3 single bonds to the
F atoms and an incomplete octet.
The other three structures have double bonds to the
F atoms.
Most texts say that the double bond structures do not occur, because they put a positive charge on the
F atom and result in a separation of charge.
Therefore,
BF3 has no π bonds.
However, resonance theory says that when you can write more than one Lewis structure for a molecule, the actual structure is a resonance hybrid of them all.
The double bonded structures may be minor contributors, but they still contribute a little bit.
In that sense, the B-F bonds have some π character.
Furthermore, the length of the B-F bonds is shorter than expected for single bonds.
This is consistent with some degree of π bonding in
BF3.
Explanation:
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