Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
How can I find the numbers of hydrogens per each peak on the NMR chart of the image?
Transcribed Image Text:3. To check your predictions, start Virtual ChemLab Organic and select Interpreting NMR Spectra – 3
from the list of assignments or click on the Qualitative Analysis bench and click on the Spectra button
on the chalkboard. You should see a list of all the compounds in the spectra library in alphabetical
order by IUPAC name. Mousing over a name in the list will show the structure on the chalkboard.
The four buttons on the side of the list are used to select the different spectroscopic techniques for the
selected compound. Click on the 'H NMR button to display the NMR spectra.
4. Using the Up or Down arows on the Scroll Bar or dragging the Scroll Bar, 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.
1Η ΝΜR
Chemical
Chemical
Multiplicity
H
Multiplicity
H
Peak
Peak
Shift (6)
Shift (6)
1
3.3
7
Structure:
2
1.4
8
3
1.2
d
9.
4
0.8
t
10
11
6
12
1Η NΜR
Chemical
Chemical
Peak
Multiplicity
Peak
Multiplicity
Shift (6)
Shift (6)
1
3.5
7
1.0
t
m
Structure:
2
2.9
d
8
0.8
fa
2.1
m
9
4
1.5
10
5
1.3
11
6
1.2
t
12
5. Using the peak information you listed in the tables for both structures, assign each peak to that
portion of the structure that produces the peak in the NMR spectrum.
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