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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

Indicate the number of signals and the multiplicity of each signal in the 1 H NMR spectrum of each of the following compounds:

a)CH3CH2CH2CH2CH2CH3

b)ICH2CH2CH2Br

c)ClCH2CH2CH2Cl

d)ICH2CH2CHBr2

Identify each of the following compounds from its molecular formula and its IR and 1H NMR spectra:

a. C6H120

b.C6H14O

c. C10H13NO3

d. C11H14O2

Predict the splitting patterns for the signals given by compounds in Problem 4.

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?

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

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