Chapter 14, Problem 14.35P

How many different types of protons are present in each compound?

a. ${{\text{(CH}}_{\text{3}}\text{)}}_{\text{3}}\text{CH}$ e. h.

b. ${{\text{(CH}}_{\text{3}}\text{)}}_{\text{3}}{\text{CC(CH}}_{\text{3}}{\text{)}}_{\text{3}}$ f. i. ${\text{CH}}_{\text{3}}{\text{CH(OH)CH}}_2{\text{CH}}_{\text{3}}$

c. ${\text{CH}}_{\text{3}}{\text{CH}}_2{\text{OCH}}_2{\text{CH}}_2{\text{CH}}_2{\text{CH}}_2{\text{CH}}_{\text{3}}$

d. ${\text{CH}}_{\text{3}}\text{CH}={\text{CH}}_2$ g. ${\text{CH}}_{\text{3}}{\text{CH}}_2{\text{CH}}_2{\text{OCH}}_2{\text{CH}}_2{\text{CH}}_{\text{3}}$ j.

Interpretation Introduction

(a)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound, two different types of protons are present.

Explanation of Solution

In the given compound ${{\text{(CH}}_{\text{3}}\text{)}}_{\text{3}}\text{CH}$, one carbon atom is bonded to three other carbon atoms on which three hydrogen atoms are present. The central carbon atom will give multiplet whereas the other three carbon atoms will give doublet in NMR spectroscopy. The splitting of peaks takes place according to $n+1$ rule. Hence, the given compound contains two different protons.

Conclusion

In the given compound, two different types of protons are present.

Interpretation Introduction

(b)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound, two different types of protons are present.

Explanation of Solution

The given compound contains only one type of proton as shown below.

Figure 1

Two carbon atomsare bonded to three other carbon atoms on which three hydrogen atoms are present. Six methyl groups give singlet due to absence of hydrogen atom on the neighboring carbon atom. Thus, only one type of proton is present.

Conclusion

In the given compound, one type of protons is present.

Interpretation Introduction

(c)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound, seven different types of protons are present.

Explanation of Solution

The given compound contains seven different types of protons each labeled as ${\text{H}}_{\text{a}}$, ${\text{H}}_{\text{b}}$, ${\text{H}}_{\text{c}}$, ${\text{H}}_{\text{d}}$, ${\text{H}}_{\text{e}}$, ${\text{H}}_{\text{f}}$ and ${\text{H}}_{\text{g}}$ as shown in Figure 2.

Figure 2

Each proton will give different chemical shift value in NMR spectroscopy.

Conclusion

In the given compound, seven different types of protons are present.

Interpretation Introduction

(d)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound, three different types of protons are present.

Explanation of Solution

The given compound contains four different types of protons each labeled as ${\text{H}}_{\text{a}}$, ${\text{H}}_{\text{b}}$, ${\text{H}}_{\text{c}}$ and ${\text{H}}_{\text{d}}$ as shown in Figure 3.

Figure 3

Since ${\text{H}}_{\text{c}}$ and ${\text{H}}_{\text{d}}$ are diastereotopic protons, each proton will give different chemical shift value in NMR spectroscopy.

Conclusion

In the given compound, four different types of protons are present.

Interpretation Introduction

(e)

Interpretation: The different types of protons present in given compound are to be predicDted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound, five differenttypes of protons are present.

Explanation of Solution

The given compound contains five different types of protons each labeled as ${\text{H}}_{\text{a}}$, ${\text{H}}_{\text{b}}$, ${\text{H}}_{\text{c}}$, ${\text{H}}_{\text{d}}$ and ${\text{H}}_{\text{e}}$ as shown in Figure 4.

Figure 4

Each proton will give different chemical shift value in NMR spectroscopy.

Conclusion

In the given compound, five different types of protons are present.

Interpretation Introduction

(f)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound, three different types of protons are present.

Explanation of Solution

The given compound contains three different types of protons each labeled as ${\text{H}}_{\text{a}}$, ${\text{H}}_{\text{b}}$ and ${\text{H}}_{\text{c}}$ as shown in Figure 5.

Figure 5

Each proton will give different chemical shift value in NMR spectroscopy.

Conclusion

In the given compound, three different types of protons are present.

Interpretation Introduction

(g)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound three different types of protons are present.

Explanation of Solution

The given compound contains three different types of protons each labeled as ${\text{H}}_{\text{a}}$, ${\text{H}}_{\text{b}}$ and ${\text{H}}_{\text{c}}$ as shown in Figure 6.

Figure 6

Each proton will give different chemical shift value in NMR spectroscopy.

Conclusion

In the given compound, three different types of protons are present.

Interpretation Introduction

(h)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound four different types of protons are present.

Explanation of Solution

The given compound contains four different types of protons each labeled as ${\text{H}}_{\text{a}}$, ${\text{H}}_{\text{b}}$, ${\text{H}}_{\text{c}}$ and ${\text{H}}_{\text{d}}$ as shown in Figure 7.

Figure 7

Each proton will give different chemical shift value in NMR spectroscopy.

Conclusion

In the given compound four different types of protons are present.

Interpretation Introduction

(i)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound, six different types of protons are present.

Explanation of Solution

In the given compound, a chiral carbon atom is bonded to another carbon atom on which two protons and an methyl group is present. Hence, these protons are termed as diasterotropic protons. Each diasterotropic protons gives different chemical shift value.

Therefore, the given compound contains six different types of protons each labeled as ${\text{H}}_{\text{a}}$, ${\text{H}}_{\text{b}}$, ${\text{H}}_{\text{c}}$, ${\text{H}}_{\text{d}}$, ${\text{H}}_{\text{e}}$ and ${\text{H}}_{\text{f}}$ as shown in Figure 8.

Figure 8

Each proton will give different chemical shift value in NMR spectroscopy.

Conclusion

In the given compound, six different types of protons are present.

Interpretation Introduction

(j)

Interpretation: The different types of protons present in given compound are to be predicted.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.

Answer to Problem 14.35P

In the given compound four different types of protons are present.

Explanation of Solution

The given compound contains four different types of protons each labeled as ${\text{H}}_{\text{a}}$, ${\text{H}}_{\text{b}}$, ${\text{H}}_{\text{c}}$ and ${\text{H}}_{\text{d}}$ as shown in Figure 9.

Figure 9

Each proton will give different chemical shift value in NMR spectroscopy.

Conclusion

In the given compound four different types of protons are present.