Draw the most stable cations formed in the mass spectrometer by a deavage of the following compoundDraw the most stable cations formed in the mass spectrometer by a cleavage of the following compoundон

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Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter12: Structure Determination: Mass Spectrometry And Infrared Spectroscopy

Section12.SE: Something Extra

Problem 17AP: The nitrogen rule of mass spectrometry says that a compound containing an odd number of nitrogens...

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Draw the molecular ion (M) for this molecule formed in the mass spectrometer. H IIZ: H -e Q
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.
Write molecular formulas for compounds that show the following molecular ions in their high-resolution mass spectra, assuming that C, H, N, and O might be present. The exact atomic masses are: 1.007 83 (1H), 12.000 00 (12C), 14.003 07 (14N), 15.994 91 (16O). (a) M+=98.0844 (b) M+=123.0320
Halogenated compounds are particularly easy to identify by their mass spectra because both chlorine and bromine occur naturally as mixtures of two abundant isotopes. Recall that chlorine occurs as 35Cl (75.8%) and 37Cl (24.2%); and bromine occurs as 79Br (50.7%) and 81Br (49.3%). At what masses do the molecular ions occur for the following formulas? What are the relative percentages of each molecular ion? (a) Bromomethane, CH3Br (b) 1-Chlorohexane, C6H13Cl
Mass spectra was obtained for an unknown compound. The spectra showed an M+2 peak with an intensity roughly 1/3rd that of the molecular ion peak, and has an odd m/z value. Which heteroatom(s) are suggested by this data?©GMU 2021 ON Br N and Br O N and Cl O N, CI, and Br Cl and Br CI
7 Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the followingcompounds. 4-methylpentan-2-ol
Which 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. alt
Draw the molecular ion (M*) for this molecule formed in the mass spectrometer. H. H -e-
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
1. Draw all possible isomers for the molecular formula C6H14 Next predict mass spectra of all isomers and explain how you would use mass spectra to identify each of the isomers.
Mass spectrometry is often used to both identify and quantify compounds. What is different between mass spectra with changing concentrations of a compound? How would you design a method (i.e. what would you need) to both identify and quantify a compound using mass spectrometry?

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Draw the most stable cations formed in the mass spectrometer by a deavage of the following compound Draw the most stable cations formed in the mass spectrometer by a cleavage of the following compound он