For the mass spectrum of B r 2 , the molecular species give peaks at m/Z ratios of 158, 160, and 162 are needed to be determined. Concept introduction: Mass spectroscopy: It is a form of spectroscopic technique which is used for the elucidation of the molecules, depending upon the mass of the molecule. Parent ion peak: It is defined as the prominent peak in the mass spectrum of the molecule which represents the not fragmented molecular ion in the given molecule with greater m/z value. Base peak: It is the tallest peak in the spectrum. B r 2 ionize to form positive ions, B r 2 + a n d B r + . Elements present in B r 2 are 79 B r a n d 81 B r .
For the mass spectrum of B r 2 , the molecular species give peaks at m/Z ratios of 158, 160, and 162 are needed to be determined. Concept introduction: Mass spectroscopy: It is a form of spectroscopic technique which is used for the elucidation of the molecules, depending upon the mass of the molecule. Parent ion peak: It is defined as the prominent peak in the mass spectrum of the molecule which represents the not fragmented molecular ion in the given molecule with greater m/z value. Base peak: It is the tallest peak in the spectrum. B r 2 ionize to form positive ions, B r 2 + a n d B r + . Elements present in B r 2 are 79 B r a n d 81 B r .
Interpretation: For the mass spectrum of Br2, the molecular species give peaks at m/Z ratios of 158, 160, and 162 are needed to be determined.
Concept introduction:
Mass spectroscopy: It is a form of spectroscopic technique which is used for the elucidation of the molecules, depending upon the mass of the molecule.
Parent ion peak: It is defined as the prominent peak in the mass spectrum of the molecule which represents the not fragmented molecular ion in the given molecule with greater m/z value.
Base peak: It is the tallest peak in the spectrum.
Br2 ionize to form positive ions, Br2+andBr+.
Elements present in Br2 are 79Brand81Br.
(b)
Interpretation Introduction
Interpretation:
For the mass spectrum of Br2, the relative intensities of the peaks has to be explained.
Concept introduction:
Mass spectroscopy: It is a form of spectroscopic technique which is used for the elucidation of the molecules, depending upon the mass of the molecule.
Parent ion peak: It is defined as the prominent peak in the mass spectrum of the molecule which represents the not fragmented molecular ion in the given molecule with greater m/z value.
Base peak: It is the tallest peak in the spectrum.
2. Predict the NMR spectra for each of these two
compounds by listing, in the NMR tables below, the
chemical shift, the splitting, and the number of
hydrogens associated with each predicted peak. Sort the
peaks from largest chemical shift to lowest.
**Not all slots must be filled**
Peak
Chemical Shift (d)
5.7
1
Multiplicity
multiplate
..........
5.04
double of doublet
2
4.98
double of doublet
3
4.05
doublet of quartet
4
5
LO
3.80
quartet
1.3
doublet
6
Peak
Chemical Shift (d)
Multiplicity
Interpreting NMR spectra is a skill that often requires some
amount of practice, which, in turn, necessitates access to a
collection of NMR spectra. Beyond Labz Organic Synthesis and
Organic Qualitative Analysis have spectral libraries containing
over 700 1H NMR spectra. In this assignment, you will take
advantage of this by first predicting the NMR spectra for two
closely related compounds and then checking your predictions
by looking up the actual spectra in the spectra library. After
completing this assignment, you may wish to select other
compounds for additional practice.
1. Write the IUPAC names for the following two structures:
Question 2
Question 3
2. Predict the NMR spectra for each of these two
compounds by listing, in the NMR tables below, the
chemical shift, the splitting, and the number of
hydrogens associated with each predicted peak. Sort the
peaks from largest chemical shift to lowest.
**Not all slots must be filled**
11:14
...
worksheets.beyondlabz.com
3. To check your predictions, click this link for Interpreting
NMR Spectra 1. You will see a list of all the
-
compounds in the spectra library in alphabetical order by
IUPAC name. Hovering over a name in the list will show
the structure on the chalkboard. The four buttons on the
top of the Spectra tab in the tray are used to select the
different spectroscopic techniques for the selected
compound. Make sure the NMR button has been selected.
4. Scroll through the list of names to find the names for the
two compounds you have been given and click on the
name to display the NMR spectrum for each. In the NMR
tables below, list the chemical shift, the splitting, and
the number of hydrogens associated with each peak for
each compound. Compare your answers to your
predictions.
**Not all slots must be filled**
Peak
Chemical Shift (d)
Multiplicity
1
2
3
4
5
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell