QUESTION 2 in H NMR spectrum, how many signals for different kinds of protons do you expect to see of the following molecules? (Textbook problem 13-3) H CA 20 OC OD D A3 8.2 C4 D.1
QUESTION 2 in H NMR spectrum, how many signals for different kinds of protons do you expect to see of the following molecules? (Textbook problem 13-3) H CA 20 OC OD D A3 8.2 C4 D.1
Chapter13: Structure Determination: Nuclear Magnetic Resonance Spectroscopy
Section13.1: Nuclear Magnetic Resonance Spectroscopy
Problem 2P
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4
![QUESTION 1
The amount of energy required to spin-flip a nucleus depends both on the strength of the external magnetic field and on the
nucleus. At a certain field strength, rf energy of 320 MHz is required to bring a ¹H nucleus into resonance. Calculate the amount of
energy (J) required to spin-flip a ¹H nucleus? Please enter your answer with 3 significant figures with scientific notation (E
notation). For example, 0.15 is 1.50E-1. (Textbook problem13-1 and 13-2)
QUESTION 2
In H NMR spectrum, how many signals for different kinds of protons do you expect to see of the following molecules? (Textbook
problem 13-3).
CA
OB
OC
OD
B
D
A3
8.2
C4
D.1
QUESTION 3
An organic sample shows a H NMR peak that is 571 Hz downfield from TMS on a spectrometer operating at 200 MHz. Convert this
peak into 8 unit (ppm)
(please enter a number to two decimal places) (Textbook problem 13.4 and 13.5)
If the same sample is recorded at 500 MHz, what will be the position of the absorption be in 8 unit (ppm)?
(please enter a number to two decimal places)
How many hertz downfield from TMS does this 500 MHz resonance correspond to
without decimals)
(plese enter a number.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcf7918c7-7ff8-45f3-a0f0-2966d536b4a9%2Fed20f4d0-5452-41c8-9638-786e811eb082%2F2a7rg4e_processed.jpeg&w=3840&q=75)
Transcribed Image Text:QUESTION 1
The amount of energy required to spin-flip a nucleus depends both on the strength of the external magnetic field and on the
nucleus. At a certain field strength, rf energy of 320 MHz is required to bring a ¹H nucleus into resonance. Calculate the amount of
energy (J) required to spin-flip a ¹H nucleus? Please enter your answer with 3 significant figures with scientific notation (E
notation). For example, 0.15 is 1.50E-1. (Textbook problem13-1 and 13-2)
QUESTION 2
In H NMR spectrum, how many signals for different kinds of protons do you expect to see of the following molecules? (Textbook
problem 13-3).
CA
OB
OC
OD
B
D
A3
8.2
C4
D.1
QUESTION 3
An organic sample shows a H NMR peak that is 571 Hz downfield from TMS on a spectrometer operating at 200 MHz. Convert this
peak into 8 unit (ppm)
(please enter a number to two decimal places) (Textbook problem 13.4 and 13.5)
If the same sample is recorded at 500 MHz, what will be the position of the absorption be in 8 unit (ppm)?
(please enter a number to two decimal places)
How many hertz downfield from TMS does this 500 MHz resonance correspond to
without decimals)
(plese enter a number.
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