Chapter 14, Problem 14.50P

How many ${}^{\text{13}}\text{C}$ NMR signals does each compound exhibit?

a. $\text{HC}{\left({\text{CH}}_{\text{3}}\right)}_{\text{3}}$ d. g.

b. e. h.

c. ${\text{CH}}_{\text{3}}\text{OCH}{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}$ f. i.

Interpretation Introduction

(a)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is two.

Explanation of Solution

In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, four carbon atoms are present out of which three carbon atoms are present in same chemical environment as shown in Figure 1. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is two.

Figure 1

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is two.

Interpretation Introduction

(b)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is five.

Explanation of Solution

In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, seven carbon atoms are present out of which three carbon atoms are present in same chemical environment as shown in Figure 2. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is five.

Figure 2

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is five.

Interpretation Introduction

(c)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.

Explanation of Solution

I In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, four carbon atoms are present out of which two carbon atoms are present in same chemical environment as shown in Figure 3. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.

Figure 3

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.

Interpretation Introduction

(d)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is seven.

Explanation of Solution

In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, seven carbon atoms are present. Each carbon atom is present in different chemical environment. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is seven.

Figure 4

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is seven.

Interpretation Introduction

(e)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.

Explanation of Solution

In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, six carbon atoms are present out of which three carbon atoms are present in same chemical environment as shown in Figure 5. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.

Figure 5

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.

Interpretation Introduction

(f)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is seven.

Explanation of Solution

In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, seven carbon atoms are present. Each carbon atom is present in different chemical environment. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is seven.

Figure 6

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is seven.

Interpretation Introduction

(g)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is five.

Explanation of Solution

In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, seven carbon atoms are present, out of which two pair of carbon atoms is present in same chemical environment as shown in Figure 7. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is five.

Figure 7

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is five.

Interpretation Introduction

(h)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is four.

Explanation of Solution

In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, six carbon atoms are present, out of which two pair of carbon atoms is present in same environment as shown in Figure 8. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is four.

Figure 8

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is four.

Interpretation Introduction

(i)

Interpretation: The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is 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. ${}^{\text{13}}\text{C}$ NMR spectroscopy identifies the number of carbon atoms present in a molecule and the nature of the functional group. The number of chemical peaks depends upon the chemical environment around carbon atoms.

Answer to Problem 14.50P

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.

Explanation of Solution

In ${}^{\text{13}}\text{C}$ NMR, the number of signals depends upon the chemical environment of each carbon atom. Same NMR signal is observed for carbon atoms present in same chemical environment. In the given compound, six carbon atoms are present, out of which three pair of carbon atoms is present in same environment as shown in Figure 9. Therefore, the number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.

Figure 9

Conclusion

The number of ${}^{\text{13}}\text{C}$ NMR signals exhibited by given compound is three.