Q10.38 P - 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: Trigonal planar

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

Step 2: Pyramidal

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

Step 3: 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).