Chapter 16, Problem 16.8QAP

Interpretation Introduction

(a)

Interpretation:

The active or inactive state of the molecule ${\text{CH}}_{\text{3}}-{\text{CH}}_{\text{3}}$ with $\text{C}-\text{C}$ stretching vibration in the IR spectrum is to be stated.

Concept introduction:

A molecule is active in the infrared spectrum if it has the net dipole moment.

The vibrations are classified into the two categories.

1. The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
2. The bending vibration (In the vibration the change in the angle between the two bonds take place).

The bending vibrations are further classified into four categories.

1. The wagging vibration.
2. The twisting vibration.
3. The rocking vibration.
4. The scissoring vibration.

Interpretation Introduction

(b)

Interpretation:

The active or inactive state of the molecule ${\text{CH}}_{\text{3}}-{\text{CCl}}_{\text{3}}$ with $\text{C}-\text{C}$ stretching vibration in the IR spectrum is to be stated.

Concept introduction:

A molecule is active in the infrared spectrum if it has the net dipole moment.

The vibrations are classified into the two categories.

1. The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
2. The bending vibration (In the vibration the change in the angle between the two bonds take place).

The bending vibrations are further classified into four categories.

1. The wagging vibration.
2. The twisting vibration.
3. The rocking vibration.
4. The scissoring vibration.

Interpretation Introduction

(c)

Interpretation:

The active or inactive state of the molecule ${\text{SO}}_{\text{2}}$ with symmetric stretching vibration in the IR spectrum is to be stated.

Concept introduction:

A molecule is active in the infrared spectrum if it has the net dipole moment.

The vibrations are classified into the two categories.

1. The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
2. The bending vibration (In the vibration the change in the angle between the two bonds take place).

The bending vibrations are further classified into four categories.

1. The wagging vibration.
2. The twisting vibration.
3. The rocking vibration.
4. The scissoring vibration.

Interpretation Introduction

(d)

Interpretation:

The active or inactive state of the molecule ${\text{CH}}_2={\text{CH}}_{\text{2}}$ with $\text{C}-\text{H}$ stretching vibration in the IR spectrum is to be stated.

Concept introduction:

A molecule is active in the infrared spectrum if it has the net dipole moment.

The vibrations are classified into the two categories.

1. The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
2. The bending vibration (In the vibration the change in the angle between the two bonds take place).

The bending vibrations are further classified into four categories.

1. The wagging vibration.
2. The twisting vibration.
3. The rocking vibration.
4. The scissoring vibration.

Interpretation Introduction

(e)

Interpretation:

The active or inactive state of the molecule ${\text{CH}}_2={\text{CH}}_{\text{2}}$ with $\text{C}-\text{H}$ stretching vibration in the IR spectrum is to be stated.

Concept introduction:

A molecule is active in the infrared spectrum if it has the net dipole moment.

The vibrations are classified into the two categories.

1. The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
2. The bending vibration (In the vibration the change in the angle between the two bonds take place).

The bending vibrations are further classified into four categories.

1. The wagging vibration.
2. The twisting vibration.
3. The rocking vibration.
4. The scissoring vibration.

Interpretation Introduction

(f)

Interpretation:

The active or inactive state of the molecule ${\text{CH}}_2={\text{CH}}_{\text{2}}$ with ${\text{CH}}_{\text{2}}$ wagging vibration in the IR spectrum is to be stated.

Concept introduction:

A molecule is active in the infrared spectrum if it has the net dipole moment.

The vibrations are classified into the two categories.

1. The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
2. The bending vibration (In the vibration the change in the angle between the two bonds take place).

The bending vibrations are further classified into four categories.

1. The wagging vibration.
2. The twisting vibration.
3. The rocking vibration.
4. The scissoring vibration.

Interpretation Introduction

(g)

Interpretation:

The active or inactive state of the molecule ${\text{CH}}_2={\text{CH}}_{\text{2}}$ with ${\text{CH}}_{\text{2}}$ twisting vibration in the IR spectrum is to be stated.

Concept introduction:

A molecule is active in the infrared spectrum if it has the net dipole moment.

The vibrations are classified into the two categories.

1. The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
2. The bending vibration (In the vibration the change in the angle between the two bonds take place).

The bending vibrations are further classified into four categories.

1. The wagging vibration.
2. The twisting vibration.
3. The rocking vibration.
4. The scissoring vibration.