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Spectroscopy Problems
31
Copyright © 2017 Pearson Education, Inc.
B.
0
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55.
D.J., an undergraduate researcher, was asked to obtain a
1
H NMR spectrum for a sample of
cis
-1,
3-dibromocyclobutane and explain the results to his fellow group members. D.J. predicted that he would see
two distinct signals in the
1
H NMR spetrum: a 4H triplet and a 2H quintet. Below is the
1
H NMR spectrum
for his sample, which his advisor assured him was the correct spectrum for
cis
-1,3-dibromocyclobutane.
How did D.J. rationalize this spectrum to his research group?
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2
2
2
56.
D.J., now more experienced in
1
H NMR interpretation, was asked to obtain a
1
H NMR spectrum for
a sample of cyclopropanol. He predicted that he would see three distinct signals in the
1
H NMR spectrum:
a 1H broad singlet, a 4H doublet, and a 1H quintet. Below is the
1
H NMR spectrum he obtained for his
sample. How does he interpret this spectrum for his group members?
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1
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2 2
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2