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

NMR Practice

Organic Chemistry

15. Analytical Techniques:IR, NMR, Mass Spect

NMR Practice

Previous problemNext problem

Problem 64b

Textbook Question

Draw the ¹H NMR spectrum you would expect to see for each of the molecules in Assessment 15.63.
(b)

Verified step by step guidance

Identify the molecular structure of the compound in Assessment 15.63 part b. Understanding the structure is crucial for predicting the ¹H NMR spectrum.

Determine the number of unique hydrogen environments in the molecule. Each unique environment corresponds to a different signal in the ¹H NMR spectrum.

Consider the chemical shift for each type of hydrogen. Chemical shifts are influenced by the electronic environment surrounding the hydrogen atoms, such as electronegative atoms or π-bonds nearby.

Evaluate the splitting pattern for each signal. The splitting pattern is determined by the number of neighboring hydrogens (n+1 rule), where n is the number of adjacent hydrogens.

Estimate the integration of each signal. The integration corresponds to the number of hydrogens contributing to each signal, providing information about the relative number of hydrogens in each environment.

Verified video answer for a similar problem:

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

Play a video:

Was this helpful?

Key Concepts

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

¹H NMR Spectroscopy

¹H NMR (Proton Nuclear Magnetic Resonance) spectroscopy is a technique used to determine the structure of organic compounds by analyzing the magnetic environment of hydrogen atoms. It provides information about the number of hydrogen environments, their chemical shifts, and the splitting patterns due to neighboring hydrogens, which helps in deducing the molecular structure.

Chemical Shift

Chemical shift in ¹H NMR refers to the resonant frequency of a hydrogen nucleus relative to a standard reference, typically tetramethylsilane (TMS). It is influenced by the electronic environment surrounding the hydrogen atom, with shifts indicating different types of chemical environments, such as aliphatic, aromatic, or adjacent to electronegative atoms.

Spin-Spin Coupling

Spin-spin coupling in ¹H NMR results in the splitting of NMR signals into multiplets, providing information about the number of neighboring hydrogen atoms. The pattern and number of peaks in a multiplet follow the n+1 rule, where n is the number of adjacent hydrogens, helping to elucidate the connectivity and structure of the molecule.

Recommended video:

Guided course

02:54

Sonogashira Coupling Reaction

Previous problemNext problem

Related Practice

Textbook Question

In the lab, ¹H NMR is often used to verify that a reaction has worked as expected by comparing the product spectrum with what is expected. Given the ¹H NMR of the reactant shown, draw the spectrum you'd expect to see of the product that results.

<IMAGE>

Textbook Question

(a) Using the ¹H NMR spectra, identify the reactants and product for this reaction.

<IMAGE>

Textbook Question

(b) Provide an arrow-pushing mechanism for the reaction.

<IMAGE>

Textbook Question

Without worrying about the relative location of the signals (i.e., the chemical shift) or the splitting patterns, draw a spectrum of the following molecule, being sure to indicate the integration of each peak. Label each signal based on the set of equivalent hydrogens to which it corresponds. [We expand on this question in future assessments.]

Textbook Question

Draw the ¹H NMR spectrum you would expect to see for each of the molecules in Assessment 15.63.

(c)

Textbook Question

Draw the ¹H NMR spectrum you would expect to see for each of the molecules in Assessment 15.63.

(d)

Textbook Question

Draw a spectrum for each of the following molecules, being sure to indicate the multiplicity, integration, and chemical shift of each peak. Label each signal based on the set of equivalent hydrogens to which it corresponds.

(b)

Textbook Question

(c)

Show more practices

Download the Mobile app

Privacy

Do not sell my personal information

Accessibility

Patent notice

Sitemap

Draw the ¹H NMR spectrum you would expect to see for each of the molecules in Assessment 15.63. (b)

Key Concepts

¹H NMR Spectroscopy

Chemical Shift

Spin-Spin Coupling

Draw the ¹H NMR spectrum you would expect to see for each of the molecules in Assessment 15.63.
(b)