Chapter 12, Problem 48A

(a)

Interpretation Introduction

Interpretation:

The molecular structure of given molecule is to be predicted.

Concept introduction:

VSEPR theory helps to draw the molecular shape as:

Total number of valence electron pairs	Number of bond pairs	Number of lone pairs	Geometry and shape
2	2	0	linear
3	3	0	Trigonal planar
	2	1	bent
4	4	0	Tetrahedral
	3	1	Pyramidal
	2	2	Bent

Answer to Problem 48A

The molecular structure of $\mathrm{C}\mathrm{B}{\mathrm{r}}_4$ is tetrahedral.

Explanation of Solution

Lewis structure of $\mathrm{C}\mathrm{B}{\mathrm{r}}_4$ is:

  

It shows, there are 4 bond pairs and no lone pairs around carbon atom. Therefore, by VSEPR theory its shape is tetrahedral.

(b)

Interpretation Introduction

Interpretation:

The molecular structure of given molecule is to be predicted.

Concept introduction:

VSEPR theory helps to draw the molecular shape as:

Total number of valence electron pairs	Number of bond pairs	Number of lone pairs	Geometry and shape
2	2	0	linear
3	3	0	Trigonal planar
	2	1	bent
4	4	0	Tetrahedral
	3	1	Pyramidal
	2	2	Bent

Answer to Problem 48A

The molecular structure of ${\mathrm{H}}_2\mathrm{S}\mathrm{e}$ is bent.

Explanation of Solution

Lewis structure of ${\mathrm{H}}_2\mathrm{S}\mathrm{e}$ is:

  

It shows, there are 2 bond pairs and 2 lone-pairs around selenium atom. Therefore, by VSEPR theory its shape is bent.

(c)

Interpretation Introduction

Interpretation:

The molecular structure of given molecule is to be predicted.

Concept introduction:

VSEPR theory helps to draw the molecular shape as:

Total number of valence electron pairs	Number of bond pairs	Number of lone pairs	Geometry and shape
2	2	0	linear
3	3	0	Trigonal planar
	2	1	bent
4	4	0	Tetrahedral
	3	1	Pyramidal
	2	2	Bent

Answer to Problem 48A

The molecular structure of $\mathrm{S}\mathrm{i}{\mathrm{H}}_4$ is tetrahedral.

Explanation of Solution

Lewis structure of $\mathrm{S}\mathrm{i}{\mathrm{H}}_4$ is:

  

It shows, there are 4 bond pairs and no lone pairs around silicon atom. Therefore, by VSEPR theory its shape is tetrahedral.