Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine Chapter 13: Q40P (page 702)
Tell precisely how you would use the proton NMR spectra to distinguish between the following pairs of compounds.
Short Answer
(a) Based on chemical shift values
(b) Based on the number of signals
(c) Based on the chemical shift values
(d) Based on the chemical shift values
Step by step solution
Theory of 1H NMR Spectrum
1H NMR spectrum is the plot of intensities of peaks versus the chemical shift in ppm. It provides the information about the structure of the compound based on the splitting pattern observed in the spectrum.
Detailed answer of part (a)
The CH2 group of protons for ethyl chloride or second compound has a higher chemical shift value as compared to ethyl bromide because chlorine is more electronegative than bromine.
Detailed answer of part (b)
The first compound shows 2 signals and second compound shows 3 signals as shown in the image with different colors:
Detailed answer of part (c)
The chemical shift for the hydrogen attached to carbonyl carbon in the firstcompound will be around 9.5鈥�10 ppm whereas the chemical shift for CH2 protons attached to carbonyl carbon in the secondcompound will show chemical shift values of around 2.0鈥�2.6 ppm.
Detailed answer of part (d)
The chemical shift for the hydrogen attached to carbonyl carbon in the first compound will be around 9.5鈥�10 ppm, whereas the chemical shift for CH3 protons attached to oxygen in the secondcompound will show chemical shift values of around 3.0-4.0 ppm.
Over 30 million students worldwide already upgrade their learning with 91影视!
and four dibrominated products
. These products are easily separated by GC-MS, but the dibrominated products are difficult to distinguish by their mass spectra. Draw the monobrominated product and the four dibrominated products and explain how
NMR would easily distinguish among these compounds.