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Chapter 14: Q13P (page 629)

Which underlined proton (or sets of protons) has the greater chemical shift (that is, the higher frequency signal)?

Short Answer

Expert verified

The protons with the greater chemical shift are underlined below.

Step by step solution

01

Step-by-Step SolutionStep 1: Electronegativity

Electronegativity is the electron attracting power of an atom.Its chemical shift is greater if a proton is attached to a higher electronegative atom. The electronegativity of chlorine is higher than bromine, so the chemical shift of the proton attached to chlorine is higher.

02

Position of protons

If a proton is near an electronegative atom,such asfluorine or chlorine, its chemical shift is higher.

Hence, the protons with a greater chemical shift are underlined below.

Underlined protons have a greater chemical shift

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Most popular questions from this chapter

A signal is seen at 600 Hz from the TMS signal in an NMR spectrometer with a 300-MHz operating frequency.

a. What is the chemical shift of the signal?

b. What is its chemical shift in an instrument operating at 500 MHz?

c. How many hertz from the TMS signal is the signal in a 500-MHz spectrometer?

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

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

What does cross peak X in figure tell you?

Identify the compound with a molecular formula C6H10O that gives the following DEPT 13C NMR spectrum:
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