Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
Question
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Chapter 16, Problem 16.8QAP
Interpretation Introduction

(a)

Interpretation:

The active or inactive state of the molecule CH3CH3 with CC 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 CH3CCl3 with CC 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 SO2 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 CH2=CH2 with CH 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 CH2=CH2 with CH 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 CH2=CH2 with CH2 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 CH2=CH2 with CH2 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.

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