Chapter 12, Problem 12.21P

Interpretation Introduction

(a)

Interpretation:

The $\alpha -$ cleavage process of ${\text{CH}}_{\text{3}}{\text{OCH}}_{\text{2}}\text{CH}{\left({\text{CH}}_{\text{3}}\right)}_2$ is to be predicted. The structure of the ion with mass $=45$ is to be drawn.

Concept introduction:

Spectroscopy method is used to identify the structure of the substance. The mass spectroscopy is used to determine the molecular mass. In the mass spectrum, the molecular ion is the most important peak. The $m/z$ of the molecular ion occurs at the molecular mass.

Interpretation Introduction

(b)

Interpretation:

The reason as to why the mass spectrum of methyl isobutyl ether does not show a peak due to inductive cleavage, in contrast to the mass spectrum of di-sec-butyl-ether is to be stated.

Concept introduction:

Spectroscopy method is used to identify the structure of the substance. The mass spectroscopy is used to determine the molecular mass. In the mass spectrum, the molecular ion is the most important peak. The $m/z$ of the molecular ion occurs at the molecular mass.

Interpretation Introduction

(c)

Interpretation:

The major difference that is expected when comparing the $\text{CI}$ mass spectrum of methyl isobutyl ether with its EI spectrum is to be stated.

Concept introduction:

The mass spectroscopy is used to determine the molecular mass. In the mass spectrum, the molecular ion is the most important peak. The $m/z$ of the molecular ion occurs at the molecular mass.