Question

Name the shape and give the ${\mathbf{AX}}_m{\mathbf{E}}_n$ classification and ideal bond angle(s) for each of the following general molecules:

(a)

(b)

(c)

Short answer

The shapes and bond angles of molecules can be determined from the VSEPR theory. The deviations arise mainly due to lone pair-lone pair repulsions.

Step-by-step solution

Trigonal planar

The shape of the molecule is trigonal planar and the expected bond angle is ${\mathbf{120}}^0$ .

Pyramidal

The shape of the molecule is pyramidal and the expected bond angle is $\mathbf{109}\mathbf{.}\mathbf{5}\mathbf{°}$.

Trigonal Bipyramidal

The shape of the molecule is trigonal bipyramidal and the expected bond angles are $\mathbf{90}\mathbf{°}$ (axial bonds) and $\mathbf{120}\mathbf{°}$(Planar bonds).