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- The nitrogen rule of mass spectrometry says that a compound containing an odd number of nitrogens has an odd-numbered molecular ion. Conversely, a compound containing an even number of nitrogens has an even-numbered M+ peak. Explain.Draw the molecular ion (M*) for this molecule formed in the mass spectrometer. - e- DrawingDraw the molecular ion (M*) for this molecule formed in the mass spectrometer. :0: H
- How can I interperet this mass spectrometry?In a mass spectrum, what m/z value would correspond to the fragment shown below?1. Which one of the given compounds is consistent with the mass spectrum below? 100 40 20 10 20 25 30 35 40 5o 55 45 60 65 70 75 m/z Courtesy of SDBS: National Institute of Advanced Industrial Science and Technology A. CH,CH,CH(CH,), В. CH,CHOHCH,CH, C. CH,CH,OCH,CH, D. CH,CH,NHCH,CH, E. CH,CH,CH,CH, Relative htensity
- Consider the mass spectrum below. 100 80- 60- 20 0.0- 0.0 60 100 miz SDBS, National Institute of Advanced Industrial Science and Technology Which peak is the molecular ion? Choose one OA OB OD. OGWhich one of the following statements is not true? O In mass spectrometry, the initially formed radical cation can sometimes survive and appear as a peak on the mass spe O Visible light is higher in energy than infrared light. O In mass spectrometry the peak corresponding to an ethyl cation fragment would appear at m/z 30. O In mass spectrometry, a benzylic cation would appear at m/z 91. O In IR spectroscopy, a C-O bond stretch would appear at a lower cm1 than a C=O bond stretch. %23 $ & 8 2 3 4 6 8 Q E R T. Y 4 5 2 K D G H. C || N M. altDraw the molecular ion (M+) for this molecule formed in the mass spectrometer. I - e- Drawing :0: ОН Q
- 1. What is the molecular ion peak in a mass spec represent? 2. What is the base peak in the mass spec? 3. In the space below differentiate between a mass spec of a compound with one chlorine and a compound with one bromine. Chlorine Brominethe mass spectrum, IR and 13 C and 1 HNMR spectra for an unknown organic molecule. Determine the structure ofthe molecule.Model 3: Ionization and Fragmentation Most mass spectrometers accelerate a molecule by first turning it into an ion, then using an electric field to accelerate it toward the detector. During standard ionization, a molecule loses one electron, the electron that is easiest to remove. The following is a hierarchy of electrons from easiest to hardest to remove: Electron in a lone pair (easiest) Electron that is part of a double bond (pi bond) Electron in a single bond (hardest) Knocking off an electron to make a +1 ion can be a harsh process. This harsh treatment often results in a broken bond, generating two smaller pieces, a +1 ion and a neutral fragment. (Note that only the ion is accelerated and detected.) ● 7. ● Critical Thinking Questions 6. If acetone is ionized, which electron is most likely to be knocked off? Replace this electron with a + (to indicate the missing electron) on the structure of acetone → The ion you drew above is called the "molecular ion" of acetone. It is…