- Questions And Training Suggest The Fragmentation Pattern For The Following Peaks A 2 Butanoe M Z 72 M Z 43 B Butan 1 (60.02 KiB) Viewed 75 times
Question 1: While running a new reaction, a chemist notices the evolution of a gas. A sample of this gas gave a mass spectrum in which the molecular ion (m/z = 44) was the largest ion peak. The only other significant peaks were observed at m/2 = 28 & m/z = 16. What is this gas? Enter a formula (without subscripting numbers) or a name in Hint: Consider the mass differences the answer box. between these ions. Question 2: A liquid compound gave a mass spectrum showing a strong molecular ion at m/z = 156. The only fragment ions are seen at m/z = 127 & 29. Suggest a structure for this compound. Enter a formula (without subscripting numbers) or a name in Hint: Consider the mass differences the answer box. between these ions. If you don't know the entire structure but would like to propose a fragment to verify that you are on the right track, fill in the fragment or fragments below: Fragment ion mass 29: Fragment ion mass 127:
Question 3: 52 Two mass spectra of gaseous compounds are shown here: Rel Abund 100 Rel Abund 100 80 80 29 60 60 30 40 40 20- 20 10 20 30 m/t 46 60 m/z 10 20 30 40 SO Compound 1 Compound 2 1. In the answer box to the right enter the name or formula of a compound that would give mass spectrum 1. 2. In the answer box to the right enter the name or formula of a compound that would give mass spectrum 2. If you enter a formula, group all atoms of the same element together and do not attempt to subscript numbers. If you enter a name, be careful to spell correctly and to use spaces where required.
Question 5: Two mass spectra of pure liquid compounds are shown here: Rel Abund 100 Rel Abund 100 804 BO 60 60- 404 404 20 204 o met 20 50 10 60 40 70 BO 90 100 VEO 30 10 20 10 50 70 60 80 90 100 Compound 1 Compound 2 1. In the answer box to the right enter the name or formula of a compound that would give mass spectrum 1. 2. In the answer box to the right enter the name or formula of a compound that would give mass spectrum 2. If you enter a formula, group all atoms of the same element together and do not attempt to subscript numbers. If you enter a name, be careful to spell correctly and to use spaces where required. Question 6: Two mass spectra of pure liquid compounds are shown here: Rel Abund 100 Rel Abund 100 94196 1156 80 BO 60 130 140 60 127 404 40 20 7901 20 mo mic 20 40 60 80 100 120 110 160 160 200 m 20 40 60 80 100120 140 150 160260 Compound 1 Compound 2 1. In the answer box to the right enter the name or formula of a compound that would give mass spectrum 1. 2. In the answer box to the right enter the name or formula of a compound that would give mass spectrum 2. If you enter a formula, group all atoms of the same element together and do not attempt to subscript numbers. If you enter a name, be careful to spell correctly and to use spaces where required. 54
Question 7: The mass spectra of two constitutional isomers are shown here. Both are gases at room temperature. The molecular ion is the small peak at m/z = 102 amu. Rel Abund 1001 Rel Abund 51 100 80- 804 83 83 60- 60- 33 40- 404 204 20- 51 102 102 m/zo 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 Isomer 1 Isomer 2 1. In the answer box to the right enter the name of the isomer that would give mass spectrum 1. 2. In the answer box to the right enter the name of the isomer that would give mass spectrum 2. Be careful to follow the IUPAC rules of nomenclature and to spell correctly. Remember to use hyphens and commas where required. Using Spectroscopy to Determine a Structural Formula
Question 4: Two mass spectra of pure liquid compounds are shown here: Rel Abund 100 Rel Abund 100 43 30 80 80 60- 86 60- 15 40 40- 20- 15 20 0 m/zo 10 20 30 40 50 60 70 80 90 100 10 20 30 m/z 40 50 60 Compound 1 Compound 2 1. In the answer box to the right enter the name or formula of a compound that would give mass spectrum 1. 2. In the answer box to the right enter the name or formula of a compound that would give mass spectrum 2. If you enter a formula, group all atoms of the same element together and do not attempt to subscript numbers. If you enter a name, be careful to spell correctly and to use spaces where required. 53