Chapter 2, Problem 2E.28E

(a)

Interpretation Introduction

Interpretation:

Whether ${\text{CH}}_{\text{3}}\text{OH}$ is likely to be polar or non-polar has to be predicted.

Concept Introduction:

VSEPR model is useful tool to determine shapes as well as properties such as polarity of molecules.

The extent of polarity is quantitatively expressed as dipole moment. It is defined as product of charges of two bonded atoms and the separation between them. The electronegativity difference decides the direction of dipole moment. It is indicated by an arrow head from positive end towards negative end.

For complex molecules, the shape must be determined prior to determination of individual dipoles. Thus shape is governed by the VSEPR model.

(b)

Interpretation Introduction

Interpretation:

Whether ${\text{CH}}_{\text{3}}{\text{NH}}_{\text{2}}$ is likely to be polar or non-polar has to be predicted.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Whether ${\text{CH}}_3{\text{OCH}}_3$ is likely to be polar or non-polar has to be predicted.

Concept Introduction:

Refer to part (a).