Label each proton with the predicted splitting pattern it exhibits in a 'H NMR spectrum. Answer Bank н н singlet quartet multiplet CI. triplet doublet CI H
Label each proton with the predicted splitting pattern it exhibits in a 'H NMR spectrum. Answer Bank н н singlet quartet multiplet CI. triplet doublet CI H
Chemistry
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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:### Proton Splitting Patterns in \( ^1H \) NMR Spectrum
**Objective:** Label each proton with the predicted splitting pattern it exhibits in a \( ^1H \) NMR spectrum.
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#### Structural Diagram
The provided molecular structure includes the following key features:
- An ester functional group (-COO-).
- Chlorine substituents connected to the central carbon.
**Protons to Label:**
- Individual protons are marked with empty boxes to fill in the expected splitting patterns.
#### Answer Bank
The splitting patterns available for selection are:
1. Singlet
2. Doublet
3. Triplet
4. Quartet
5. Multiplet
#### Explanation of Proton Environments:
1. **Proton “a” (next to two Cl atoms):**
- Experiencing no neighboring hydrogen atoms.
- **Splitting Pattern:** Singlet (no neighboring protons).
2. **Proton “b” (adjacent to a proton and Cl atoms):**
- Experiencing one neighboring proton.
- **Splitting Pattern:** Doublet (1 neighboring proton).
3. **Proton “c” (adjacent to proton ‘b’ and the COO group):**
- Experiencing one neighboring proton.
- **Splitting Pattern:** Doublet (1 neighboring proton).
4. **Proton “d” (adjacent to the ester oxygen):**
- Experiencing no neighboring hydrogen atoms.
- **Splitting Pattern:** Singlet (no neighboring protons).
5. **Proton “e” and “f” (adjacent to each other):**
- Each experiencing only one neighboring proton.
- **Splitting Pattern:** Doublet (1 neighboring proton).
#### Detailed Diagram:
To visually indicate the labels:
- **Proton ‘a’ (H next to Cl atoms):** Singlet
- **Proton ‘b’ (H attached to central C):** Doublet
- **Proton ‘c’ (H adjacent to COO):** Doublet
- **Proton ‘d’ (H adjacent to ester oxygen):** Singlet
- **Proton ‘e’ and ‘f’ (adjacent to each other on terminal CH₂):** Doublet each
By understanding the chemical environment and the neighboring hydrogen atoms, accurate NMR splitting patterns can be predicted for each proton in the structure. This knowledge is crucial for interpreting \( ^
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