For ${BF}_{3}$ molecule which of the following is true?

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Observed $B - F$ bond length is found to be less than the expected bond length

B-atom is $s p^{2}$ hybridized

There is a $p π - p π$ back bonding in this molecule

All of the above

answer is D.

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Detailed Solution

The center B in ${BF}_{3}$ contains three bond pairs. It has a trigonal planner shape and is hence ${sp}^{2}$ hybridized.

Because F can provide a lone pair of electrons to the unoccupied 2p orbitals of the central atom in ${BF}_{3}$ , there is back bonding between F atoms and the center (B).

Due to back bonding, the $B - F$ bond length in ${BF}_{3}$ is lower than what would be predicted. Back bonding results in a partial double bond character and uniform bond lengths.

Here, all the statements are correct. Hence, option D is correct.

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