The reason as to why the 1 H NMR spectrum of cyclohexane shows a single peak at room temperature but shows two peaks when the temperature is lowered is to be stated. Concept introduction: Many nuclei and electrons have spin, due to this spin magnetic moment arises. The energy of this magnetic moment depends on the orientation of the applied magnetic field. In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. Tetramethylsilane (TMS) is taken as reference.

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Answer 1

Question

Chapter 12, Problem 12B.9P

(a)

Interpretation Introduction

Interpretation:

The reason as to why the 1H NMR spectrum of cyclohexane shows a single peak at room temperature but shows two peaks when the temperature is lowered is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises. The energy of this magnetic moment depends on the orientation of the applied magnetic field. In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. Tetramethylsilane (TMS) is taken as reference.

(b)

Interpretation Introduction

Interpretation:

The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

(c)

Interpretation Introduction

Interpretation:

The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

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Answer 2

Question

Chapter 12, Problem 12B.9P

(a)

Interpretation Introduction

Interpretation:

The reason as to why the 1H NMR spectrum of cyclohexane shows a single peak at room temperature but shows two peaks when the temperature is lowered is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises. The energy of this magnetic moment depends on the orientation of the applied magnetic field. In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. Tetramethylsilane (TMS) is taken as reference.

(b)

Interpretation Introduction

Interpretation:

The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

(c)

Interpretation Introduction

Interpretation:

The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

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Answer 3

Question

Chapter 12, Problem 12B.9P

(a)

Interpretation Introduction

Interpretation:

The reason as to why the 1H NMR spectrum of cyclohexane shows a single peak at room temperature but shows two peaks when the temperature is lowered is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises. The energy of this magnetic moment depends on the orientation of the applied magnetic field. In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. Tetramethylsilane (TMS) is taken as reference.

(b)

Interpretation Introduction

Interpretation:

The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

(c)

Interpretation Introduction

Interpretation:

The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

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Answer 4

Question

Chapter 12, Problem 12B.9P

(a)

Interpretation Introduction

Interpretation:

The reason as to why the 1H NMR spectrum of cyclohexane shows a single peak at room temperature but shows two peaks when the temperature is lowered is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises. The energy of this magnetic moment depends on the orientation of the applied magnetic field. In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. Tetramethylsilane (TMS) is taken as reference.

(b)

Interpretation Introduction

Interpretation:

The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

(c)

Interpretation Introduction

Interpretation:

The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

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Answer 5

Chapter 12, Problem 12B.9P

(a)

Interpretation Introduction

Interpretation:

The reason as to why the 1H NMR spectrum of cyclohexane shows a single peak at room temperature but shows two peaks when the temperature is lowered is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises. The energy of this magnetic moment depends on the orientation of the applied magnetic field. In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. Tetramethylsilane (TMS) is taken as reference.

(b)

Interpretation Introduction

Interpretation:

The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

(c)

Interpretation Introduction

Interpretation:

The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

Answer 6

Chapter 12, Problem 12B.9P

(a)

Interpretation Introduction

Interpretation:

The reason as to why the 1H NMR spectrum of cyclohexane shows a single peak at room temperature but shows two peaks when the temperature is lowered is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises. The energy of this magnetic moment depends on the orientation of the applied magnetic field. In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. Tetramethylsilane (TMS) is taken as reference.

Answer 7

Chapter 12, Problem 12B.9P

(a)

Interpretation Introduction

Interpretation:

The reason as to why the 1H NMR spectrum of cyclohexane shows a single peak at room temperature but shows two peaks when the temperature is lowered is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises. The energy of this magnetic moment depends on the orientation of the applied magnetic field. In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. Tetramethylsilane (TMS) is taken as reference.

Answer 8

(b)

Interpretation Introduction

Interpretation:

The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

Answer 9

(b)

Interpretation Introduction

Interpretation:

The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

Answer 10

(c)

Interpretation Introduction

Interpretation:

The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

Answer 11

(c)

Interpretation Introduction

Interpretation:

The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 12 - Prob. 12B.1ST Ch. 12 - Prob. 12B.2ST Ch. 12 - Prob. 12B.3ST Ch. 12 - Prob. 12D.1ST Ch. 12 - Prob. 12A.1DQ Ch. 12 - Prob. 12A.2DQ Ch. 12 - Prob. 12A.3DQ Ch. 12 - Prob. 12A.1AE Ch. 12 - Prob. 12A.1BE Ch. 12 - Prob. 12A.2AE

Interpretation: The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated. Concept introduction: Same as metioned in concept introduction in part (a).

Interpretation: The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated. Concept introduction: Same as metioned in concept introduction in part (a).

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Chapter 12 Solutions

Interpretation:

The reason as to why the 19F NMR spectrum of PF5 shows two lines even at the lowest experimentally accessible temperature has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).

Interpretation:

The reason as to why the triplet and quartet obtained in the 1H NMR spectrum of ethanol shows additional splitting if water is excluded from the sample has to be stated.

Concept introduction:

Same as metioned in concept introduction in part (a).