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  4. The formation of molecular complex BF3 — NH3 results in a change in hybridization of boron

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Q. The formation of molecular complex $BF_3 — NH_3$ results in a change in hybridization of boron

AIEEEAIEEE 2012Chemical Bonding and Molecular Structure

Solution:

In $BF_3$, B is $sp^2$ hybridized with one empty $p_z$ orbital. The empty $p_z$ orbital of $BF_3$ can be filled by lone pair of molecules such as $NH_3$. When this occurs a tetrahedral molecule or ion is farmed which is $sp^3$ hybridized.