True or False please answer part B only a. A proton with a chemical shift of 600HZ relative to TMS in a 600MHZ NMR appearsat 0.5 ppm in a 300 MHz NMR.b. The coupling constant Ja in 1-bromo-2-chloroethane which is 6.0 Hz in a 200 MHzNMR is 12.0 Hz in a 400 MHz NMR.c. 1,1-dimethylcyclohexane at temperatures that prevent conformational interconversionexhibits 6 chemical shifts in the proton NMR spectrum.d. "CNMR spectra cannot normally be integrated without the use of a specialized NMRtechnique because of long relaxation times.e. Protons that are downfield are shieldedf. 1-Chlorocyclohexane has diastereotopic hydrogensg. Non-first order effects in proton NMR spectra are more important as the chemicalshift difference between two protons gets larger than their coupling interaction,

Answered: b. The coupling constant J,a in…

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b. The coupling constant J,a in 1-bromo-2-chloroethane which is 6.0 Hz in a 200 MHz NMR is 12.0 Hz in a 400 MHz NMR

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL3: Carbon (13c) Nmr Spectroscopy

Section: Chapter Questions

Problem 6CTQ

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Question

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True or False

please answer part B only

a. A proton with a chemical shift of 600HZ relative to TMS in a 600MHZ NMR appears
at 0.5 ppm in a 300 MHz NMR.
b. The coupling constant Ja in 1-bromo-2-chloroethane which is 6.0 Hz in a 200 MHz
NMR is 12.0 Hz in a 400 MHz NMR.
c. 1,1-dimethylcyclohexane at temperatures that prevent conformational interconversion
exhibits 6 chemical shifts in the proton NMR spectrum.
d. "CNMR spectra cannot normally be integrated without the use of a specialized NMR
technique because of long relaxation times.
e. Protons that are downfield are shielded
f. 1-Chlorocyclohexane has diastereotopic hydrogens
g. Non-first order effects in proton NMR spectra are more important as the chemical
shift difference between two protons gets larger than their coupling interaction,

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