Q10.39P - Chemistry: Molecular Nature Of Matter And Change

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)  

Step-by-Step Solution

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 1: Square pyramidal

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

Step 2: T shaped

The shape of the molecule is T-shaped. It can be derived from the trigonal bipyramidal shape and the expected bond angles are $\mathbf{90}\mathbf{°}$  (axial bonds) and $120°$  (Planar bonds).

Step 3: Tetrahedral

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