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Chapter 14: Q24P (page 640)

Explain the relative chemical shifts of the benzene ring protons in Figure 14.18.

Short Answer

Expert verified

For proton a it is 7.52 ppm.

For proton b it is 7.64 ppm.

For proton c it is 8.21 ppm.

Step by step solution

01

Step-by-Step SolutionStep 1: Chemical shift  value

The chemical shift represents the position of signals with respect to some standard reference compound TMS. It also represents the processional frequency of different protons present in a molecule.

The chemical shift value for each proton in a benzene ring is near about 7.2 ppm.

02

Chemical shift value for protons of the benzene ring

If the electron-withdrawing group is attached then de-sheilding occurs and the chemical shift value increases. Hence, chemical shift value for c proton is relatively high which is 8.21 ppm, while for proton a and b it is 7.52 ppm and 7.64 ppm, respectively.

Protons in benzene ring

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Most popular questions from this chapter

Draw a splitting diagram for the Hb proton if Jbc=10 and Jba=5.

Answer the following questions:

a. What is the relationship between chemical shift in ppm and operating frequency?

b. What is the relationship between chemical shift in hertz and operating frequency?

c. What is the relationship between coupling constant in hertz and operating frequency?

d. How does the operating frequency in NMR spectroscopy compare with the operating frequency in IR and UV/Vis spectroscopy?

Identify pairs of coupled protons in the compound whose COSY spectrum is shown below:

Draw a diagram like the one shown in Figure 14.12 to predict;

a. the relative intensities of the peaks in a triplet.

b. the relative intensities of the peaks in a quintet.

Match each of the 1HNMR spectra with one of the following compounds:

a.

b.

c.
See all solutions

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