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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

Organic Chemistry
Organic Chemistry
9th Edition
ISBN:9781305080485
Author:John E. McMurry
Publisher:John E. McMurry
Chapter13: Structure Determination: Nuclear Magnetic Resonance Spectroscopy
Section13.1: Nuclear Magnetic Resonance Spectroscopy
Problem 1P
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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.
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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