Chapter 12, Problem 12.22SP

Interpretation Introduction

Interpretation: The trends in abundance of the molecular ions and the ions at mass $57$ and the intensities of the peaks of the mass spectrums of $\text{n}-\text{octane}$, $\text{3,}\text{4}-\text{dimethylhexane}$ and $\text{2,}\text{2,}\text{3,}\text{3}-\text{tetramethylbutane}$ are to be predicted.

Concept introduction: Mass spectroscopy provides a reliable molecular weight for an unknown compound and also gives us the information about the molecular formula as well.

Fragmentation gives the resonance stabilized cations whenever possible. Loss of a small molecule is usually indicated by a fragment peak having an even mass number corresponding to loss of an even mass number.

To determine: The trends in abundance of the molecular ions and the ions at mass $57$ and the intensities of the peaks of the mass spectrums of $\text{n}-\text{octane}$, $\text{3,}\text{4}-\text{dimethylhexane}$ and $\text{2,}\text{2,}\text{3,}\text{3}-\text{tetramethylbutane}$.