Predict the molecular weight of the most likely fragments in the ...

[mynx]

Predict the molecular weight of the most likely fragments in the mass spectrum of the following compound.

Question 2

Which type of spectroscopy (IR, 1H NMR, UV, or MS) will be best to distinguish between the pair of
  compounds below? Give a brief reason.

 

Question 3

Which type of spectroscopy (IR, 1H NMR, UV, or MS) will be best to distinguish between the pair of
  compounds below? Give a brief reason.

 

Question 4

Which type of spectroscopy (IR, 1H NMR, UV, or MS) will be best to distinguish between the pair of
  compounds below? Give a brief reason.

 

Question 5

Which type of spectroscopy (IR, 1H NMR, UV, or MS) will be best to distinguish between the pair of
  compounds below? Give a brief reason.

 

Question 6

Which type of spectroscopy (IR, 1H NMR, UV, or MS) will be best to distinguish between the pair of
  compounds below? Give a brief reason.

 

Question 7

Which type of spectroscopy (IR, 1H NMR, UV, or MS) will be best to distinguish between the pair of
  compounds below? Give a brief reason.

 

Question 8

Besides the obvious difference in molecular weight, how can mass spectrometry be used to distinguish
  between the following compounds?

 

Question 9

Besides the obvious difference in molecular weight, how can mass spectrometry be used to distinguish
  between the following compounds?

 

Question 10

Besides the obvious difference in molecular weight, how can mass spectrometry be used to distinguish
  between the following compounds?

 

Question 11

Besides the obvious difference in molecular weight, how can mass spectrometry be used to distinguish
  between the following compounds?

 

Question 12

How can mass spectrometry be used to distinguish between the following compounds?
 

Question 13

Predict the relative intensity of the M+2 peak in the mass spectrum of the following compound
 

Question 14

Predict the relative intensity of the M+2 peak in the mass spectrum of the following compound.
 

Question 15

Predict the relative intensity of the M+1 peak in the mass spectrum of the following compound
 

[Leostella20]

Answer to Question 1



Answer to Question 2

ANS: UV will show a difference in the
max position due to conjugation.

Answer to Question 3

ANS: IR will show a difference in the shape of the peaks in the 3300  3500 cm1 region. The alcohol will
show one strong broad parabolic peak, while the amine will show two weak sharp peaks in the region.

Answer to Question 4

ANS: Mass spec will show a difference in fragmentation patterns, or proton NMR will show a difference in
splitting patterns.

Answer to Question 5

ANS: UV will show a difference in the
max position due to conjugation.

Answer to Question 6

ANS: Proton NMR will show differences in the splitting patterns.

Answer to Question 7

will

Answer to Question 8

ANS: The amine will have an odd numbered M+.

Answer to Question 9

The dichloro compound will show significant M+2 and M+4 peaks while the monochloro compound
will have only an M+2 peak.

Answer to Question 10

difference in contribution to the M+2 peak. Sulfur contributes 4.4 intensity, while oxygen
contributes only 0.2.

Answer to Question 11

Fluorinated compounds can easily lose the fluorine atom to give a large peak at M-19.

Answer to Question 12

These compounds have the same molecular weight, but different fragmentation patterns. 2-pentanol
will have a large peak at m/z = 73, while 3-pentanol will have a large peak at m/z = 59.

Answer to Question 13

Chlorine contributes 33 to the intensity of M+2, while bromine contributes 100 to the intensity.
Result is M+2 will be 133 of the intensity of M+.

Answer to Question 14

One sulfur atom contributes 4.4 to the M+2 intensity. Result is M+2 will be 4.4 of the intensity of
M+.

Answer to Question 15

14 carbons each contribute 1.1 to the M+1 intensity. Result is M+1 will be 15.4 of the intensity of
M+.

Answer to Question 16



Answer to Question 17

ANS: Peaks resulting from an n   transition are generally at longer wavelengths and have lower molar
absorptivities than peaks from    transitions.

Answer to Question 18

d

Answer to Question 19

d

Answer to Question 20

e

Answer to Question 21

d

Answer to Question 22

e

Answer to Question 23

c

Answer to Question 24

e

Answer to Question 25

b

Answer to Question 26

e

Answer to Question 27

d

Answer to Question 28

c

Answer to Question 29

b

Answer to Question 30

a

Answer to Question 31

a

Answer to Question 32

c

Answer to Question 33

c

Answer to Question 34

a

Answer to Question 35

d

Answer to Question 36



Answer to Question 37



Answer to Question 38



Answer to Question 39



Answer to Question 40



Answer to Question 41



Answer to Question 42



Answer to Question 43



Answer to Question 44



Answer to Question 45



Answer to Question 46



Answer to Question 47

H
a  3.21 quintet
Hb  1.44 quartet

Answer to Question 48

H
a  0.9 doublet
Hb  3.3 doublet
H
c  0.9 triplet

Answer to Question 49

a

Answer to Question 50

b

Answer to Question 51

d

Answer to Question 52

e

Answer to Question 53

b

Answer to Question 54

a

Answer to Question 55

d

Answer to Question 56

d

Answer to Question 57

c

Answer to Question 58

e

Answer to Question 59

a

Answer to Question 60

c

Answer to Question 61

c

Answer to Question 62

b

Answer to Question 63

c

Answer to Question 64

e

Answer to Question 65

d

Answer to Question 66

d

Answer to Question 67

d

Answer to Question 68

c

Answer to Question 69

d

Answer to Question 70

b

Answer to Question 71

a

Answer to Question 72

c

Answer to Question 73

c

Answer to Question 74

b

Answer to Question 75

d

Answer to Question 76

a

Answer to Question 77

b

Answer to Question 78

a

Answer to Question 79

c

Answer to Question 80

a

Answer to Question 81

d

Answer to Question 82

a

Answer to Question 83

 bonds are formed by head-to head overlap of p orbitals:

[mynx]

TY

[Leostella20]

You're welcome