1. The two mass spectra below correspond to two isomers of CSH10O2: methyl butanoate and valeric acid. Match the spectrum with the appropriate compound. Place the m/z ratio and the structures (show all atoms) for the labeled fragments in the table below. 100 - Compound HS-NU-1700 80 - Methyl butanoate 60 40 CH3 H3C 20 10 20 30 40 50 60 70 80 90 100 m/z 100 - Compound HS-NU-3125 3 80 Valeric acid 60 - 4 40 H3C. HO, 20 - 10 20 30 40 50 60 70 80 90 100 m/z Fragment 1 74 Fragment 2 Fragment 3 Fragment 4 87 m/z Fragment

Principles of Instrumental Analysis
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Chapter19: Nuclear Magnetic Resonance Spectroscopy
Section: Chapter Questions
Problem 19.21QAP
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1.
The two mass spectra below correspond to two isomers of C5H10O2: methyl
butanoate and valeric acid. Match the spectrum with the appropriate compound. Place the
m/z ratio and the structures (show all atoms) for the labeled fragments in the table below.
100 -
Compound
MS-NU-1708
Methyl butanoate
80 -
1
60 -
40 -
CH3
2
H3C
20 -
10
20
30
40
50
60
70
80
90
100
m/z
100 -
Compound
MS-NU-3125
3
80 -
Valeric acid
60 -
4
40 -
H3C
20 -
10
20
30
40
50
60
70
80
90
100
m/z
Fragment 1
Fragment 2
Fragment 3
Fragment 4
m/z
74
87
Fragment
Relative Intensity
Transcribed Image Text:1. The two mass spectra below correspond to two isomers of C5H10O2: methyl butanoate and valeric acid. Match the spectrum with the appropriate compound. Place the m/z ratio and the structures (show all atoms) for the labeled fragments in the table below. 100 - Compound MS-NU-1708 Methyl butanoate 80 - 1 60 - 40 - CH3 2 H3C 20 - 10 20 30 40 50 60 70 80 90 100 m/z 100 - Compound MS-NU-3125 3 80 - Valeric acid 60 - 4 40 - H3C 20 - 10 20 30 40 50 60 70 80 90 100 m/z Fragment 1 Fragment 2 Fragment 3 Fragment 4 m/z 74 87 Fragment Relative Intensity
The three compounds shown below are structural isomers of each other. Match
each compound with its corresponding mass spectrum and draw the fragment ion
corresponding to the base peak in each.
b.
а.
c.
с.
HO
100 -
Compound
80 -
60 -
Fragment
40-
20 -
10
20
30
40
50
60
70
80
90
m/z
100 -
Compound
HS-NU-0749
80 -
60-
Fragment
40 -
20 -
10
20
30
40
50
60
70
80
m/z
100 -
Compound
HS-NU-1103
80 -
60 -
Fragment
40 -
20 -
10
20
30
40
50
60
70
80
m/z
Relative
Intensity
Relative Intensity
Relative Intensity
Transcribed Image Text:The three compounds shown below are structural isomers of each other. Match each compound with its corresponding mass spectrum and draw the fragment ion corresponding to the base peak in each. b. а. c. с. HO 100 - Compound 80 - 60 - Fragment 40- 20 - 10 20 30 40 50 60 70 80 90 m/z 100 - Compound HS-NU-0749 80 - 60- Fragment 40 - 20 - 10 20 30 40 50 60 70 80 m/z 100 - Compound HS-NU-1103 80 - 60 - Fragment 40 - 20 - 10 20 30 40 50 60 70 80 m/z Relative Intensity Relative Intensity Relative Intensity
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