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

1H NMR:Spin-Splitting (N + 1) Rule

Organic Chemistry

15. Analytical Techniques:IR, NMR, Mass Spect

1H NMR:Spin-Splitting (N + 1) Rule

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3:40 minutes

Problem 29

Textbook Question

Though Figure 15.34 was concerned with the appearance of H_a, how would H_b appear in the spectrum?

Verified step by step guidance

Identify the molecule in question and locate the hydrogen atom labeled as H₆. This will help in understanding its chemical environment.

Determine the electronic environment around H₆. Consider factors such as the presence of electronegative atoms, pi bonds, or aromatic rings that might influence the chemical shift.

Consider the splitting pattern of H₆. Analyze the number of neighboring hydrogen atoms (n) using the n+1 rule to predict the multiplicity of the signal.

Estimate the chemical shift range for H₆ based on its environment. Use known chemical shift ranges for different types of hydrogen environments (e.g., alkane, alkene, aromatic) as a reference.

Consider any coupling constants that might affect the appearance of H₆ in the spectrum. This includes analyzing the coupling with nearby hydrogen atoms and how it might affect the signal's appearance.

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Key Concepts

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

NMR Spectroscopy

Nuclear Magnetic Resonance (NMR) Spectroscopy is a technique used to determine the structure of organic compounds by observing the magnetic properties of atomic nuclei. In the context of the question, understanding how different hydrogen atoms (like Hₐ and H₆) appear in the spectrum is crucial for interpreting molecular structure.

Chemical Shift

Chemical shift refers to the variation in the resonance frequency of a nucleus due to its electronic environment. In NMR spectroscopy, different hydrogen atoms in a molecule will have different chemical shifts, which helps in identifying their positions and environments within the molecule.

Spin-Spin Coupling

Spin-spin coupling is the interaction between nuclear spins that leads to splitting of NMR signals into multiple peaks. This phenomenon provides information about the number of neighboring hydrogen atoms and their arrangement, which is essential for understanding how H₆ would appear in the spectrum.

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Related Practice

Textbook Question

Predict the splitting patterns for the signals given by the compounds in Problem 4.

Textbook Question

Predict the splitting patterns for the signals given by the compounds in Problem 4.

c. CH₂=CCl₂

Textbook Question

Label each set of chemically equivalent protons, using a for the set that will be at the lowest frequency in the ¹H NMR spectrum, b for the next lowest, and so on. Indicate the multiplicity of each signal.

Textbook Question

In Figure 15.34, H_a was assumed to be 'up.' How does the analysis change if we assume instead that H_a is down?

Textbook Question

Every number in Pascal’s triangle is the sum of the two numbers above it. Given this, fill in the missing numbers.

Textbook Question

Indicate the number of signals and the multiplicity of each signal in the 1H NMR spectrum of each of the following compounds:

c. ClCH₂CH₂CH₂Cl

Textbook Question

Indicate the number of signals and the multiplicity of each signal in the 1H NMR spectrum of each of the following compounds:

a. CH₃CH₂CH₂CH₂CH₂CH₃

Textbook Question

Predict the splitting patterns for the signals given by the compounds in Problem 4.

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Though Figure 15.34 was concerned with the appearance of Ha, how would Hb appear in the spectrum?

Key Concepts

NMR Spectroscopy

Chemical Shift

Spin-Spin Coupling

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Though Figure 15.34 was concerned with the appearance of H_a, how would H_b appear in the spectrum?