Question

The formation of molecular complex $BF_3 ??NH_3$ results in a change in hybridization of boron

• A. from $sp^2$ to $dsp^2$
• B. from $sp^2$ to $sp^3$
• C. from $sp^3$ to $sp^2$
• D. from $sp^3$ to $sp^3d$

Answer 1

Answer: (B)

from $sp^2$ to $sp^3$

Answer 2

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.