Question

The following is the mass spectrum for compound A. The molecular ion peak showed an intense M+2 peak with 1:1 ratio with M(136) peak. Relative Abundance 57 100 80 60 40 20 M (136) 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 m/z a) Identify the element present in compound A based on the molecular ion peak. (1 mark) b) State the mass to charge ratio, m/z of the M+2 peak. (1 mark) c) Give the reason for the existence of M+2 peak. (2 marks) d) Determine the molecular formula of compound A using the Rule of Thirteen. (4 marks) e) Propose the structure of compound A. (1 mark) f) Predict the structure of the fragment for the base peak, m/z =57. (2 marks)

          The following is the mass spectrum for compound A. The molecular ion peak showed an intense M+2 peak with 1:1 ratio with M(136) peak.

Relative Abundance
57
100
80
60
40
20
M (136)
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140
m/z

a) Identify the element present in compound A based on the molecular ion peak. (1 mark)
b) State the mass to charge ratio, m/z of the M+2 peak. (1 mark)
c) Give the reason for the existence of M+2 peak. (2 marks)
d) Determine the molecular formula of compound A using the Rule of Thirteen. (4 marks)
e) Propose the structure of compound A. (1 mark)
f) Predict the structure of the fragment for the base peak, m/z =57. (2 marks)

The following is the mass spectrum for compound A. The molecular ion peak showed an intense M+2 peak with 1:1 ratio with M(136) peak.

Relative Abundance
57
100
80
60
40
20
M (136)
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140
m/z

a) Identify the element present in compound A based on the molecular ion peak. (1 mark)
b) State the mass to charge ratio, m/z of the M+2 peak. (1 mark)
c) Give the reason for the existence of M+2 peak. (2 marks)
d) Determine the molecular formula of compound A using the Rule of Thirteen. (4 marks)
e) Propose the structure of compound A. (1 mark)
f) Predict the structure of the fragment for the base peak, m/z =57. (2 marks)

Added by Emilio J.

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