Chapter 10.29, Problem 48P

(a)

Interpretation Introduction

Interpretation:

Number of signals obtained in the ${}^{\text{13}}\text{C NMR}$ spectrum of the given has to be predicted.

Concept introduction:

${}^{\text{13}}\text{C}$ NMR spectroscopy:

It is the study of the interaction between electromagnetic radiation and the nuclei of the carbon atoms.

The signals in the ${}^{\text{13}}\text{C NMR}$ spectrum of a compound is proportional to the number of carbons that are present in the different environment within the molecule.

(b)

Interpretation Introduction

Interpretation:

The signal that is observed at the lowest frequency in ${}^{13}CNMR$ spectroscopy has to be determined for the given compound.

Concept introduction:

${}^{\text{13}}\text{C}$ NMR spectroscopy:

It is the study of the interaction between electromagnetic radiation and the nuclei of the carbon atoms.

The signals in the ${}^{\text{13}}\text{C NMR}$ spectrum of a compound is proportional to the number of carbons that are present in the different environment within the molecule. The carbon that is present in the electron-rich environment shows a signal at a lower frequency and vice-versa. Therefore, the carbon that is present nearest to the electron-withdrawing groups produces a high-frequency signal.