Which one of the following is NOT part of a ¹H-NMR spectrum? O Chemical Shift Coupling Constant Degrees of Unsaturation O Integration O Spin-Spin Splitting
Which one of the following is NOT part of a ¹H-NMR spectrum? O Chemical Shift Coupling Constant Degrees of Unsaturation O Integration O Spin-Spin Splitting
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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
Transcribed Image Text:### Instructions for Spectroscopy Problems
**To ensure accuracy in your responses, follow these guidelines very carefully:**
1. **Read the Directions Carefully:**
Not following the directions may lead to incorrect answers.
2. **Format Your Answers as Directed:**
Incorrect formatting of your answers may result in them being marked wrong.
3. **Reference Tables:**
Below are the IR regions and NMR chemical shifts tables for assistance with spectroscopy problems.
---
### Nuclear Magnetic Resonance (NMR) Chemical Shifts
#### 1H NMR (Proton NMR) Chemical Shifts:
- **12 - 10 ppm:** Hydrogen atoms in carboxylic acids (R-C=O)OH and aldehydes (R-C=O)H.
- **10 - 9 ppm:** Aldehyde hydrogen atoms (R-CH=O).
- **8 - 7 ppm:** Aromatic protons (benzene rings).
- **7 - 6 ppm:** Protons attached to carbon-carbon double bonds (C=CH).
- **6 - 5 ppm:** Vinyl protons (H-C=C).
- **5 - 4 ppm:** Hydrogen atoms attached to electronegative atoms such as F, Cl, Br (H-C-X), and ethers (H-C-O).
- **4 - 3 ppm:** Hydrogen atoms in carbon chains with electronegative substituents.
- **3 - 2 ppm:** Hydrogen atoms attached to alkynes (H-C≡C), thiols (H-C-S), and amides (H-C-N).
- **2 - 1 ppm:** Hydrogen atoms in benzylic positions (H-C6H5) and methyl groups (H-C-CH3).
### Infrared (IR) Spectroscopy Table
The provided IR spectroscopy table illustrates important functional group absorptions based on wavenumber (cm^-1):
- **3400 - 3200 cm^-1:**
- Broad absorbance range for O-H and N-H bonds.
- Sharp absorbance for ≡C-H bonds.
- **3200 - 3000 cm^-1:**
- Absorbance due to aromatic C-H stretching.
- Alkyne ≡C-H stretching is observed.
- **3000 - 2850 cm^-1:**
- Absorbance for sp3 C-H stretching.
- **2850 - 2750 cm^-1
![### Question: Identifying Non-Part of ¹H-NMR Spectrum
**Which one of the following is NOT part of a ¹H-NMR spectrum?**
- [ ] Chemical Shift
- [ ] Coupling Constant
- [ ] Degrees of Unsaturation
- [ ] Integration
- [ ] Spin-Spin Splitting
### Explanation of Terms in ¹H-NMR Spectrum
1. **Chemical Shift**:
- It represents the resonance frequency of a nucleus relative to a standard in a magnetic field. It's crucial for identifying the environment around hydrogen atoms in the molecule.
2. **Coupling Constant**:
- This describes the interaction between nuclear spins of neighboring hydrogen atoms. It's measured in Hertz (Hz) and provides information on the number of adjacent protons.
3. **Integration**:
- This indicates the relative number of hydrogen atoms responsible for each signal in the spectrum, helping determine the molecular structure.
4. **Spin-Spin Splitting**:
- Also known as J-coupling, it describes the splitting of NMR signals into multiple peaks due to interaction with nearby non-equivalent protons.
### Incorrect Option
- **Degrees of Unsaturation**:
- This is not part of a ¹H-NMR spectrum. Instead, it is a concept used to calculate the number of rings and pi bonds in a molecule based on its molecular formula.
This is a crucial differentiation for students and professionals using NMR spectroscopy in Organic Chemistry to analyze molecular structures accurately.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ffdac5784-6171-4c2d-813f-cbb526f56bfb%2Fbb96d93b-0b73-4ad4-88b3-8b4bfb2a2e24%2Fi5l3qfh_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Question: Identifying Non-Part of ¹H-NMR Spectrum
**Which one of the following is NOT part of a ¹H-NMR spectrum?**
- [ ] Chemical Shift
- [ ] Coupling Constant
- [ ] Degrees of Unsaturation
- [ ] Integration
- [ ] Spin-Spin Splitting
### Explanation of Terms in ¹H-NMR Spectrum
1. **Chemical Shift**:
- It represents the resonance frequency of a nucleus relative to a standard in a magnetic field. It's crucial for identifying the environment around hydrogen atoms in the molecule.
2. **Coupling Constant**:
- This describes the interaction between nuclear spins of neighboring hydrogen atoms. It's measured in Hertz (Hz) and provides information on the number of adjacent protons.
3. **Integration**:
- This indicates the relative number of hydrogen atoms responsible for each signal in the spectrum, helping determine the molecular structure.
4. **Spin-Spin Splitting**:
- Also known as J-coupling, it describes the splitting of NMR signals into multiple peaks due to interaction with nearby non-equivalent protons.
### Incorrect Option
- **Degrees of Unsaturation**:
- This is not part of a ¹H-NMR spectrum. Instead, it is a concept used to calculate the number of rings and pi bonds in a molecule based on its molecular formula.
This is a crucial differentiation for students and professionals using NMR spectroscopy in Organic Chemistry to analyze molecular structures accurately.
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