Draw the molecular ion (M*) for this molecule formed in the mass spectrometer. H. H -e-

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 Relative Intensity 100 80 60 40- 20 0-mm 10 100- 80 a. 20- 115-14-5501 0-mm 10 20 b. =0 20 30 30 40 40 50 50 60 m/z 60 m/z 70 70 80 80 90 100 90 100 Relative Intensity Relative Intensity 100- 80 40 20 0 100 80 40 10 20- 15-NU-5580 15 20 25 115--555 ont 10 20 30 30 35 40 45 50 55 m/z 40 50 m/z 60 60 70 65 70 75 80 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.

What type of compounds/molecules can be detected using LC-MS and what mass range or molecular mass ranges can be detected using LC-MS?

Match the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make sure to consider the isotope pattern) 100 120 Br A 121 x B NH ន 122 Mass M/e 123 123 Me 124 124 OH но ма 125 D 126

Please answer g only

The mass spectrum below belongs to a compound that contains: Relative Intensity 100- 8 90 20- MS2011-04537CM 0-tbn Chlorine Bromine Fluorine Oxygen 25 50 75 m/z maltempl 100 125

Explain why the mass-to-charge ratio of lions in the EI mass spectrometer are usually equal to the mass of the ions?

3

Q1. Using Mass Spectrometry how you can differentiate between the following pairs. A) (B) (C) (D) CH₂-CH₂-CH3 i and SA CH3 CH CH₂ CH3 CH3 CH3-CH₂-CH₂-CH₂-CH₂-Br and CH₂-CH₂-CH-CH₂-CH₂ Br || CH3 CH3 CH CH3 and CH₂ CH₂ CH₂ CH,-CH,-CH2–CH, NH, and CH,`CH,`CH,-NH-CH,

In mass spectrometry, there are patterns in the molecular ion region due to isotopic abundances Identify the pattern that would correspond to a molecule containing two chlorines. || A)I M M Me B) II IV C) II Mat D) IV E) V Met