Which of the following is the correct prediction about observed B - F – InterviewSolution

1.	Which of the following is the correct prediction about observed B - F bond length in BF_3 molecule ?
Answer» 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. `BF_3 and [BF_4]^(-)` have equal B - F bond length . The decrease in the B - F bond length in `BF_3` is due to delocalised `ppi - ppi` bonding between vacant 2p ORBITAL of B and filled 2p orbital of F The correct B - X bond length order is `B - F gtBClgtB-BrgtB-I` ANSWER :C

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