Chapter 3, Problem 3F.7E

(a)

Interpretation Introduction

Interpretation:

Shapes of ${\text{PBr}}_{\text{3}}$ and ${\text{PF}}_{\text{3}}$ have to be predicted. Also, molecule that forms liquid with higher boiling point has to be determined.

Concept Introduction:

Valence shell electron pair repulsion theory or VSEPR model is used to determine geometry of molecules. This is done with help of number of electron pairs that are present around central atom. According to this model, electron groups are arranged in such manner that minimizes repulsion with other electrons.

(b)

Interpretation Introduction

Interpretation:

Shapes of ${\text{SO}}_2$ and ${\text{O}}_{\text{3}}$ have to be predicted. Also, molecule that forms liquid with higher boiling point has to be determined.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Shapes of ${\text{BF}}_3$ and ${\text{BCl}}_3$ have to be predicted. Also molecule that forms liquid with higher boiling point has to be determined.

Concept Introduction:

Refer to part (a).