Concept explainers
Describe the appearance of the
NMR spectrum of each of the following compounds. How many signals would you expect to find, and into how many peaks will each signal be split?
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Organic Chemistry - Standalone book
- 1Compound 1 has molecular formula C7H16. It shows three signals in the 1H-NMR spectrum, one at 0.85 ppm, one at 1.02 ppm, and one at 1.62 ppm. The relative integrals of these three signals are 6, 1, and 1, respectively. Compound 2 has molecular formula C7H14. It shows three signals in the 1H-NMR spectrum, one at 0.98 ppm, one at 1.36 ppm, and one at 1.55 ppm. The relative integrals of these three signals are 3, 2, and 2, respectively. Propose structures for compounds 1 and 2, explaining how you reach your conclusion.arrow_forwardFor the following compound how many different signals would you see in the carbon NMR? (Assume that you can see them all.) 4 O 5 O 3 09 CO |arrow_forwardThe structure of citronellal is shown below, with the carbon atoms numbered. Also shown is a table of 13C NMR signals for the molecule and the 13C-NMR DEPT spectrum. Assign each signal in the 13C-NMR spectrum to a numbered carbon in the molecule.arrow_forward
- The following molecule will give two signals in the proton (¹H) NMR. H₂C What is the ratio of the signal intensities for the two peaks? 2:2 O 3:1 3:2 CH₂ O 2:1arrow_forwardA 13C NMR spectrum is shown for a molecule with the molecular formula of C4H8O2. Draw the structure that best fits this data.arrow_forwardA compound with the molecular formula C4H₁1N has the following ¹H NMR spectrum, in which the relative integration values are illustrated with step curves. Which of the following is the correct number of protons giving rise to each signal? al O2H, 3H, 6H Ο 1Η, 4Η, 6Η O 2H, 4H, 5H O 3H, 4H, 5H PPMarrow_forward
- How many signals would you expect to see in the 1H NMR spectrum of each of the five compounds with molecular formula C6H14?arrow_forwardEach of the following molecules has a unique 1H NMR spectrum. Choose the molecule(s) that will only show two signals, with an integration ratio of 2:3, in their 1H NMR spectrum.arrow_forwardA'H NMR spectrum is shown for a molecule with the molecular formula of CeH9Br. Draw the structure that best fits this data.arrow_forward
- How many peaks will each of the following molecules show in its proton NMR spectrum in order from left to right? H 1, 1, 4 1, 1, 2 2, 1, 1 2, 1, 2 Br H CI H3C CH3 H₂C (111) -CH3arrow_forwardCan you please confirm if this H-NMR spectrum belongs to this molecule and identify the signals of each spectrum.arrow_forwardPredict the number of signals and the splitting pattern of each signal in the 1H-NMR spectrum of each moleculearrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning