Title: Understanding Carbon-13 NMR SpectraDescription:This exercise involves selecting the compound best represented by a given carbon-13 NMR spectrum. Four compounds are displayed, labeled A, B, C, and D, each with distinct structures.Diagram:The NMR spectrum features chemical shift values on the x-axis, ranging from 0 to 220 ppm. Notable peaks are present around the following ppm values: 170, 130, 120, and 20.Choices:- Compound A: Features a carbonyl group and a double bond.- Compound B: Contains an epoxide ring.- Compound C: Includes a bridged ketone structure.- Compound D: Shows a simple cyclic ether structure.Task:Assess the chemical shifts in the spectrum. Remember:- Peaks around 170 ppm imply the presence of a carbonyl group.- Peaks around 120-130 ppm suggest double bonds or aromatic carbons.- Peaks near 20 ppm indicate aliphatic carbons.Based on these observations, determine which compound corresponds to the displayed NMR spectrum. Select your answer:- Compound C- Compound A- Compound D- Compound B

Answered: Which of the four compounds is best…

Which of the four compounds is best represented by the carbon-13 NMR spectrum shown below? A 220 200 180 160 140 120 100 80 60 40 20 ppm Compound C Compound A Compound D Compound B

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Title: Understanding Carbon-13 NMR Spectra

Description:
This exercise involves selecting the compound best represented by a given carbon-13 NMR spectrum. Four compounds are displayed, labeled A, B, C, and D, each with distinct structures.

Diagram:
The NMR spectrum features chemical shift values on the x-axis, ranging from 0 to 220 ppm. Notable peaks are present around the following ppm values: 170, 130, 120, and 20.

Choices:
- Compound A: Features a carbonyl group and a double bond.
- Compound B: Contains an epoxide ring.
- Compound C: Includes a bridged ketone structure.
- Compound D: Shows a simple cyclic ether structure.

Task:
Assess the chemical shifts in the spectrum. Remember:
- Peaks around 170 ppm imply the presence of a carbonyl group.
- Peaks around 120-130 ppm suggest double bonds or aromatic carbons.
- Peaks near 20 ppm indicate aliphatic carbons.

Based on these observations, determine which compound corresponds to the displayed NMR spectrum.

Select your answer:
- Compound C
- Compound A
- Compound D
- Compound B

Expert Solution

Step 1

¹³C NMR spectrum gives a brief idea about the structural aspects of a molecule. Number of signals in spectrum depends on the carbon atoms with different environment.

The electron density on the carbon atom decides the position of the peak in the spectrum.

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