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CGP EDU Academic Team
Published on: August 14, 2026
Which of the following is the correct prediction about observed B — F bond length in BF 3 molecule?
A
B - F bond length in BF 3 is found to be less than theoretical value because the electronegativity values of B (2.04) and F (4.0) suggest the bond length to be ionic and hence, the attraction between oppositely charged ions must decrease the bond length.
B
BF 3 and [BF 4 ] - have equal B - F bond length.
C
The decrease in the B - F bond length in BF 3 is due to delocalized p 
- p 
bonding between vacant 2p orbital of B and filled 2p orbital of F
- p bonding between vacant 2p orbital of B and filled 2p orbital of F
D
The correct B - X bond length order is B-F>B-Cl>B-Br>B-I
Text Solution
Verified by ExpertsThe correct answer is:
D
The decrease in the B - F bond length in BF 3 is due to delocalised 
bonding between vacant 2p orbital of B and filled
It has partial double character in B - F bond due to 
back bonding.
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