A) \[B{{F}_{4}}^{-}\]
B) \[{{H}_{3}}N\to B{{F}_{3}}\]
C) \[B{{F}_{3}}\]
D) \[B{{F}_{3}}\leftarrow N\,M{{e}_{3}}\]
Correct Answer: C
Solution :
\[B{{F}_{3}}\] has \[p\pi -p\pi \] back bonding so B-F bond length is shortest.
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