Compound C shows a molecular ion at m/z 148 and other prominent peaks at m/z 105 and 77. Following are its infrared and 1H-NMR spectra.Q.) Account for the appearance of peaks in its mass spectrum at m/z 105 and 77. Compound CSH3H2H2H1087320 ppmChemical shift (8)Micrometers2.51001011121314 15209080* 70605040302010Compound C40003600320028002400200018001600140012001000800600400Wavenumber (cm-!)Transmittance (%)

Mass spectroscopy is an analytical tool, it is used for identifying mass to charge ratio (m/z),…

Compound C SH 3H 2H 2H 10 8 7 3 2 0 ppm Chemical shift (8) Micrometers 2.5 100 10 11 12 13 14 15 20 90 80 * 70 60 50 40 30 20 10 Compound C 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Wavenumber (cm-!) Transmittance (%)

Compound C SH 3H 2H 2H 10 8 7 3 2 0 ppm Chemical shift (8) Micrometers 2.5 100 10 11 12 13 14 15 20 90 80 * 70 60 50 40 30 20 10 Compound C 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Wavenumber (cm-!) Transmittance (%)

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter25: Instruments For Optical Spectrometry

Section: Chapter Questions

Problem 25.20QAP

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Concept explainers

NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.

Question

Compound C shows a molecular ion at m/z 148 and other prominent peaks at m/z 105 and 77. Following are its infrared and ¹H-NMR spectra.

Q.) Account for the appearance of peaks in its mass spectrum at m/z 105 and 77.

Compound C
SH
3H
2H
2H
10
8
7
3
2
0 ppm
Chemical shift (8)
Micrometers
2.5
100
10
11
12
13
14 15
20
90
80
* 70
60
50
40
30
20
10
Compound C
4000
3600
3200
2800
2400
2000
1800
1600
1400
1200
1000
800
600
400
Wavenumber (cm-!)
Transmittance (%)

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