Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

15. Analytical Techniques:IR, NMR, Mass Spect

Carbon NMR

Organic Chemistry

15. Analytical Techniques:IR, NMR, Mass Spect

Carbon NMR

Previous problemNext problem

3:53 minutes

Problem 47b(1)

Textbook Question

How many signals are produced by each of the following compounds in its
b. ¹³C NMR spectrum?
1.

Verified step by step guidance

Step 1: Analyze the structure of the compound. The molecule consists of a benzene ring substituted with an isopropyl group and an ethoxy group. Each carbon atom in the molecule needs to be evaluated for symmetry and chemical environment.

Step 2: Determine the symmetry of the benzene ring. The benzene ring has two substituents in a para arrangement (opposite sides). This symmetry means that the carbons in the benzene ring will produce fewer unique signals due to equivalent environments.

Step 3: Evaluate the isopropyl group. The isopropyl group has two methyl carbons that are equivalent due to symmetry, and one carbon attached to the benzene ring. These will contribute distinct signals.

Step 4: Evaluate the ethoxy group. The ethoxy group has two distinct carbons: one directly attached to the benzene ring (oxygen-bound carbon) and one in the ethyl chain. These carbons are in different environments and will produce unique signals.

Step 5: Count the total number of unique carbon environments. Combine the contributions from the benzene ring, isopropyl group, and ethoxy group to determine the total number of signals in the 13C NMR spectrum.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Video duration:

Play a video:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Carbon Environment in NMR

In 13C NMR spectroscopy, each unique carbon environment in a molecule produces a distinct signal. The environment is determined by the carbon's connectivity and the surrounding atoms. For example, carbons bonded to different functional groups or in different hybridization states will resonate at different chemical shifts, leading to multiple signals in the spectrum.

Symmetry and Signal Count

The symmetry of a molecule significantly affects the number of signals observed in its NMR spectrum. If a molecule has symmetrical elements, some carbon environments may be equivalent, resulting in fewer signals. Analyzing the structure for symmetry can help predict how many unique signals will appear in the 13C NMR spectrum.

Integration and Signal Intensity

In NMR spectroscopy, the area under each signal (integration) correlates with the number of equivalent nuclei contributing to that signal. While 13C NMR does not provide direct integration like 1H NMR, understanding the relative intensities of signals can help infer the number of equivalent carbons in the molecule, aiding in the interpretation of the spectrum.

Watch next

Master 13C NMR General Features with a bite sized video explanation from Johnny

Start learning

Related Videos

Related Practice

Textbook Question

How many signals are produced by each of the following compounds in its

b. ¹³C NMR spectrum?

Textbook Question

How many signals are produced by each of the following compounds in its

b. ¹³C NMR spectrum?

Textbook Question

Would it be better to use ¹H NMR or ¹³C NMR spectroscopy to distinguish 1-butene, cis-2-butene, and 2-methylpropene? Explain your answer.

Textbook Question

How many signals are produced by each of the following compounds in its

b. ¹³C NMR spectrum?

Textbook Question

How can 1,2-, 1,3-, and 1,4-dinitrobenzene be distinguished by

b. ¹³C NMR spectroscopy?

Textbook Question

Sketch the following spectra that would be obtained for 2-chloroethanol:

d. The proton-coupled ¹³C NMR spectrum.

Textbook Question

Sketch the following spectra that would be obtained for 2-chloroethanol:

c. The ¹³C NMR spectrum.

Textbook Question

Compound A, with molecular formula C₄H₉Cl, shows two signals in its ¹³C NMR spectrum. Compound B, an isomer of compound A, shows four signals, and in the proton-coupled mode, the signal farthest downfield is a doublet. Identify compounds A and B.

Show more practices

Download the Mobile app

Privacy

Do not sell my personal information

Accessibility

Patent notice

Sitemap

How many signals are produced by each of the following compounds in itsb. 13C NMR spectrum?1.

Key Concepts

Carbon Environment in NMR

Symmetry and Signal Count

Integration and Signal Intensity

Watch next

How many signals are produced by each of the following compounds in its
b. ¹³C NMR spectrum?
1.