The following 'H NMR spectrum was taken with a 750 MHz spectrometer: 1.0 0.5 0.0 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 ' 2.0 1.0 0.0 (ppm) What is the difference Av in the frequency of RF ac Δν ac radiation absorbed by the a and c protons? (Note: it's not equal to the difference in chemical shifts.) Round your answer to 2 significant digits, and be sure it has an appropriate unit symbol. = O O a will shift left, c will shift right. O a will shift right, c will shift left. a and c will both shift left, with more space between them. Suppose a new spectrum is taken with a 500 MHz spectrometer. What will be true about this new spectrum? O a and c will both shift left, with less space between them. O a and c will both shift right, with more space between them. O a and c will both shift right, with less space between them. Which protons have the largest energy gap between spin up and spin down states? O None of the above. ○ a Ob Explanation Check C Ar B 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Center

Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter19: Nuclear Magnetic Resonance Spectroscopy
Section: Chapter Questions
Problem 19.13QAP
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The following 'H NMR spectrum was taken with a 750 MHz spectrometer:
1.0
0.5
0.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0 ' 2.0
1.0
0.0
(ppm)
What is the difference Av
in the frequency of RF
ac
Δν
ac
radiation absorbed by the a and c protons? (Note:
it's not equal to the difference in chemical shifts.)
Round your answer to 2 significant digits, and be
sure it has an appropriate unit symbol.
=
O
O a will shift left, c will shift right.
O a will shift right, c will shift left.
a and c will both shift left, with more space
between them.
Suppose a new spectrum is taken with a 500 MHz
spectrometer. What will be true about this new
spectrum?
O
a and c will both shift left, with less space
between them.
O
a and c will both shift right, with more space
between them.
O
a and c will both shift right, with less space
between them.
Which protons have the largest energy gap
between spin up and spin down states?
O None of the above.
○ a
Ob
Explanation
Check
C
Ar
B
2025 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Center
Transcribed Image Text:The following 'H NMR spectrum was taken with a 750 MHz spectrometer: 1.0 0.5 0.0 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 ' 2.0 1.0 0.0 (ppm) What is the difference Av in the frequency of RF ac Δν ac radiation absorbed by the a and c protons? (Note: it's not equal to the difference in chemical shifts.) Round your answer to 2 significant digits, and be sure it has an appropriate unit symbol. = O O a will shift left, c will shift right. O a will shift right, c will shift left. a and c will both shift left, with more space between them. Suppose a new spectrum is taken with a 500 MHz spectrometer. What will be true about this new spectrum? O a and c will both shift left, with less space between them. O a and c will both shift right, with more space between them. O a and c will both shift right, with less space between them. Which protons have the largest energy gap between spin up and spin down states? O None of the above. ○ a Ob Explanation Check C Ar B 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Center
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