Chapter 16, Problem 16.42AP

Interpretation Introduction

Interpretation:

The resonance interaction of the electron pairs on the oxygen with the ring $\pi$ electrons to explain the observation of greater chemical shift of protons ${\text{H}}^a$ in $p$-methoxy-toluene than the chemical shift of protons ${\text{H}}^b$ 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. 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.