Answered: How many signals are greater than 100…

How many signals are greater than 100 ppm in the 13C NMR? How many signals are less than 100 ppm in the 13C NMR? How many total signals in the 13C 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 9E

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Concept explainers

Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.

Question

How many signals are greater than 100 ppm in the ¹³C NMR?

How many signals are less than 100 ppm in the ¹³C NMR?

How many total signals in the ¹³C NMR?

Expert Solution

Chemical shift value:

The chemical shift in ¹³c NMR :

RCH₃= 10- 15 ppm

R₂CH₂= 16 - 25 ppm

R₃CH = 25- 35 ppm

Factor affecting the chemical shift value is electonegetivity , if any electronegative atom is present in molecule it Deshiled the proton of ¹³C carbon an as a result chemical shift value is increase from normal one. In given examples oxygen atom is present which show heigh electonegetivity.

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