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  4. The main factor responsible for weak acidic nature of B-F bonds in BF3 is :-

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Q. The main factor responsible for weak acidic nature of $B-F$ bonds in $BF_{3}$ is :-

NTA AbhyasNTA Abhyas 2020

Solution:

Solution
Due to $p\pi -p\pi $ back bonding, the vacant orbital of $B$ accepts a lone pair of $e^{-}$ . Hence, the $B-F$ bonds in $BF_{3}$ becomes weakly acidic.