Chapter 9, Problem 14PP

Interpretation Introduction

Interpretation:

The splitting pattern and number peaks that would occur for (b) protons of ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{Z}$ when $J_{ab}=2J_{bc}\text{\hspace{0.17em}and\hspace{0.17em}}{J}_{ab}=J_{bc}$ are to be determined.

Concept introduction:

A compound containing protons or carbon-13, when placed under very strong magnetic field and treated with electromagnetic energy radiation of suitable frequency, the nuclei of the compound absorbs energy through a process called magnetic resonance.

Nuclear magnetic resonance spectroscopy is a graph showing characteristic energy absorption frequencies and intensities of a compound under magnetic field.

The number of signals in the spectrum indicates the number of different proton environments present in the molecule.

Signal splitting arises from the phenomenon known as spin-spin coupling. The effects of this coupling are transferred through electron bonds that leads to splitting by spin-spin coupling.

The spin-spin coupling effects are due to vicinal hydrogens. Vicinal hydrogens are protons connected to adjacent carbons. The legs of split align or overlap with other legs like overlapping of internal legs of the splits increases the intensity of the peak.