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Exam 13: Nuclear Magnetic Resonance Spectroscopy

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Question 51

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Which of the protons in the following molecule appear at the highest ?-value in the ¹H NMR spectrum? $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ O $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ || $\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{C}-\mathrm{H}$ $\quad$ i $\quad$$\quad$$\quad$ ii $\quad$$\quad$ iii $\quad$$\quad$$\quad$ iv

A) i
B) ii
C) iii
D) iv

E) C) and D)
F) A) and C)

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Question 52

Multiple Choice

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The chemical shift of the protons of acetone, CH₃COCH₃, is 2.1 ppm when the spectrum is obtained at 250 MHz. What is the chemical shift of these protons when the spectrum is acquired at 500 MHz?

A) 1.05 ppm
B) 2.1 ppm
C) 4.2 ppm
D) 8.4 ppm

E) All of the above
F) B) and D)

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Question 53

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Identify the compound (C₃H₇Cl) that gives the following ¹H NMR spectrum.

For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband hydrogen-decoupled ¹³C NMR spectra. Enter the numerical value in the blank provided to the left of the structure. -_______

Which of the carbon atoms in the molecule appears furthest downfield in the ¹³C NMR spectrum?

The coupling constant, J, between the protons of chloroethane is 7 Hz when the spectrum is obtained at 250 MHz. What is the coupling constant between these protons when the spectrum is acquired at 500 MHz?

Which of the following compounds gives a ¹H NMR spectrum consisting of only a singlet?

How many signals appear in the proton-decoupled ¹³C NMR spectrum of 4-bromotoluene?

Which feature in the ¹H NMR spectrum provides information about the number of neighboring protons of each proton in the compound?

What does "Y" denote in the coupling parameter ^xJ_y?

How many signals appear in proton-decoupled ¹³C NMR spectrum of 2,5-dimethylhexane?

How many types of equivalent hydrogens are present in the following compound? ​

How many signals appear in the proton-decoupled ¹³C NMR spectrum of 3-bromotoluene?

Identify the compound (C₄H₆O₂) that gives the following ¹H NMR spectrum.

Identify the compound (C₄H₈O) that gives the following ¹H NMR spectrum.

How many signals appear in proton-decoupled ¹³C NMR spectrum of 3,4-dimethylhexane?

Identify the methyl hydrogen with the highest chemical shift.

Which C₄H₉Br compound gives a triplet at approximately 3.5 ppm in the ¹H NMR spectrum?

How many signals appear in the proton-decoupled ¹³C NMR spectrum of 1,2-dibromobenzene?