1. For each of the following statements, indicate whether they are true of false. ⚫nuclear magnetic resonance provides information about the environment of individual C and H atoms as well as nearby C and H atoms. ⚫ in many cases, is possible to determine the precise structure of an organic compound using just nuclear magnetic resonance spectroscopy. ⚫ since nuclear magnetic resonance spectroscopy is so powerful, there is really no need to use other methods such as mass spectrometry, infrared spectroscopy and UV-Vis absorption spectroscopy. • chemical shifts are reported in parts per million (ppm) and not Hz because this method gives numbers that are independent of the operating frequency of the spectrometer. ⚫ coupling constants vary with direct proportionality to the operating frequency of the spectrometer. ⚫ the exact number of protons that give rise to a particular signal can be determined through integration of the signal. • multiplicity is a term used to describe the number of peaks in a signal and their relative heights. • the N+1 rule works only when Av/J< 10. • protons that resonate at relatively high frequency appear in the upfield region of the spectrum. • diamagnetic anisotropy strongly influences the chemical shifts of protons attached to carbon atoms that form π bonds.

1. For each of the following statements, indicate whether they are true of false. ⚫nuclear magnetic resonance provides information about the environment of individual C and H atoms as well as nearby C and H atoms. ⚫ in many cases, is possible to determine the precise structure of an organic compound using just nuclear magnetic resonance spectroscopy. ⚫ since nuclear magnetic resonance spectroscopy is so powerful, there is really no need to use other methods such as mass spectrometry, infrared spectroscopy and UV-Vis absorption spectroscopy. • chemical shifts are reported in parts per million (ppm) and not Hz because this method gives numbers that are independent of the operating frequency of the spectrometer. ⚫ coupling constants vary with direct proportionality to the operating frequency of the spectrometer. ⚫ the exact number of protons that give rise to a particular signal can be determined through integration of the signal. • multiplicity is a term used to describe the number of peaks in a signal and their relative heights. • the N+1 rule works only when Av/J< 10. • protons that resonate at relatively high frequency appear in the upfield region of the spectrum. • diamagnetic anisotropy strongly influences the chemical shifts of protons attached to carbon atoms that form π bonds.

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter12: Chirality

Section: Chapter Questions

Problem 29CTQ

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