14. Shown below are the mass spectra (without data tables) of four molecules. (The structure of each molecule is shown on the spectrum.) Mark the [M]* peak for each, and indicate the molecular weight of the molecule. Relative Intensity 100- 20 0-fmrtn 10 100- 8 8 $ & 0- a. 10 b. 20 20 30 40 50 60 m/z m/z 70 80 90 100 100 100- Relative Intensity 80 Relative Intensity 8 20 100- 8 8 9 20 10 15 20 25 30 e 0- -8 35 40 45 50 55 60 65 70 m/z m/z Based on the five mass spectra you have seen, describe how one might identify the [M]* peak (molecular ion peak) on the mass spectrum of an unknown compound.

14. Shown below are the mass spectra (without data tables) of four molecules. (The structure of each molecule is shown on the spectrum.) Mark the [M]* peak for each, and indicate the molecular weight of the molecule. Relative Intensity 100- 20 0-fmrtn 10 100- 8 8 $ & 0- a. 10 b. 20 20 30 40 50 60 m/z m/z 70 80 90 100 100 100- Relative Intensity 80 Relative Intensity 8 20 100- 8 8 9 20 10 15 20 25 30 e 0- -8 35 40 45 50 55 60 65 70 m/z m/z Based on the five mass spectra you have seen, describe how one might identify the [M]* peak (molecular ion peak) on the mass spectrum of an unknown compound.

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter14: Mass Spectrometry

Section: Chapter Questions

Problem 14.24P

See similar textbooks

Similar questions

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
Following is the mass spectrum of 3-methyl-2-butanol. The molecular ion m/z 88 does not appear in this spectrum. Propose structural formulas for the cations of m/z 45, 43, and 41.
Following is the mass spectrum of an unknown compound. The two highest peaks are at m/z 120 and 122. Suggest a structure for this compound. (Data from http://webbook.nist.gov/chemistry/.)
Following is the mass spectrum of bromocyclopentane. The molecular ion m/z 148 is of such low intensity that it does not appear in this spectrum. Assign structural formulas for the cations of m/z 69 and 41.
How will E for an isolated 13C nucleus compare with that of a 1H nucleus?
3. A molecule with three types of atoms has the mass spectrum shown below. The molecular ion peak has an intensity of 23 and the (M+1)* peak has an intensity of 1.3. What is the molecular formula for this compound? 100- |72 80- 44 60- 40- 2어 20 30 40 50 m/z 10 60 70 80 90 Relative Intensity
Which of the following statements about the mass spectrum of CH3Br is correct? A.) presents two peaks of intensity 3: 1 with m / z equal to 94 and 96 b.) presents two peaks of equal intensity with m / z equal to 94 and 96 C.) presents a single peak of the molecular ion with m / z of 44 D.) has a single peak of the molecular ion with m / z of 95