   Chapter 2, Problem 99PS

Chapter
Section
Textbook Problem

The mass spectrum of CH3\$Cl is illustrated here. You know that carbon has two stable isotopes, and 13C with relative abundances of 98.9% and 1.1%, respectively, and chlorine has two isotopes, 35a and 37CI with abundances of 75.77% and 24.23%, respectively.(a) What molecular species gives rise to the lines at m/Z of 50 and 52? Why is the line at 52 about 1/3 the height of the line at 50?(b) What species might be responsible for the line at m/Z = 51?

(a)

Interpretation Introduction

Interpretation:

For the mass spectrum of CHCl3, the molecular species give peaks at m/Z ratios of 50 and 52 , the species give peaks at m/Z ratio of 51  has to be identified.

Concept introduction:

Mass spectroscopy: It is a form of spectroscopic technique which is used for the elucidation of the molecules, depending upon the mass of the molecule.

Parent ion peak: It is defined as the prominent peak in the mass spectrum of the molecule which represents the not fragmented molecular ion in the given molecule with greater m/z value.

Base peak: It is the tallest peak in the spectrum.

CH3Cl ionize to form positive ions. Some of them fragment into smaller ions.

Elements present in CH3Cl are 12C,13C,35Cl,37ClandH.

Explanation

m/Z ratios of 50 and 52  shows prominent peaks, so they are CH3Cl+

The elements present in CH3Cl are 12C,13C,35Cl,37ClandH, so the m/Z (charge is taken as one) ratios of one12Cor13Cwithone35Clor37ClandthreeH are,

m/Z

(b)

Interpretation Introduction

Interpretation:

The reason for line at 52  is about 1/3 the height of line at 50  has to be explained.

Concept introduction:

Mass spectroscopy: It is a form of spectroscopic technique which is used for the elucidation of the molecules, depending upon the mass of the molecule.

Parent ion peak: It is defined as the prominent peak in the mass spectrum of the molecule which represents the not fragmented molecular ion in the given molecule with greater m/z value.

Base peak: It is the tallest peak in the spectrum.

CH3Cl ionize to form positive ions. Some of them fragment into smaller ions.

Elements present in CH3Cl are 12C,13C,35Cl,37ClandH.

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