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Chapter 14: Q25P (page 642)

How can theirH1NMR spectra distinguish the following compounds?


Short Answer

Expert verified

A)

B)

C)

Step by step solution

01

Step-by-Step SolutionStep 1: Signals in NMR Spectroscopy

The NMR signals indicate the different types of protons in a molecule.If the NMR spectra show six different peaks then it indicates that there are six different types of protons present.

02

Step 2:  H1NMR spectra for the molecules

In compound A , 1-Bromo nitrobenzene the compound shows four different signals. Two doublets and two doublets of doublets as shown below;

Compound ‘A’

In compound B , 3-Bromo nitrobenzene the compound shows four different signals. Two doublets, one singlet, and one doublet of doublets as shown below;

Compound ‘B’

In compound C , 4-Bromo nitrobenzene the compound shows two different signals. Two doublets as shown below;

Compound ‘C’

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Most popular questions from this chapter

Sketch the following spectra that would be obtained for 2-chloroethnol:

a. The 1H NMR spectrum for an anhydrous sample of the alcohol.

b. The 1H NMR spectrum for a sample of the alcohol that contains a trace amount of acid.

c. The 13C NMR spectrum.

d. The proton-coupled 13C NMR spectrum.

e. The four parts of a DEPT13C NMR spectrum.

There are four esters with molecular formula C4H8O2. How can they be distinguished by1H NMR?

The 1H NMR spectrum of 2-propane-1-ol is shown here. Indicate the protons in the molecule that are responsible for each of the signals in the spectrum.

How many hertz from the TMS signal is the signal occurring at 2.0 ppm

a. in a 300 MHz spectrometer?

b. in a 500 MHz spectrometer?

a. If two signals differ by 1.5 ppm in a 300 MHz spectrometer, by how much do they differ in a 500 MHz spectrometer?

b. If two signals differ by 90 Hz in a 300 MHz spectrometer, by how much do they differ in a 500 MHz spectrometer?
See all solutions

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