In the 'H NMR spectrum of bromoethane, the indicated methylene proton (italicized, red font) is split into what type of spin-spin splitting pattern?
In the 'H NMR spectrum of bromoethane, the indicated methylene proton (italicized, red font) is split into what type of spin-spin splitting pattern?
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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![### Understanding Spin-Spin Splitting Patterns in the NMR Spectrum of Bromoethane
In this module, we explore the concept of spin-spin splitting patterns in proton NMR spectroscopy, specifically focusing on bromoethane.
**Question:**
In the \( ^1H \) NMR spectrum of bromoethane, the indicated methylene proton (**italicized, red font**) is split into what type of spin-spin splitting pattern?
**Chemical Structure:**
```plaintext
Br
|
H — C — H
|
CH₃
```
**Options:**
- one peak
- two peaks
- three peaks
- four peaks
- five peaks
**Explanation:**
For the given molecule, bromoethane:
- The **methylene group** (–CH₂–) has protons that are adjacent to a **methyl group** (–CH₃).
- According to the N+1 rule in NMR spectroscopy, where N is the number of neighboring protons, the proton in question will split into (N+1) peaks.
- The methyl group (–CH₃) has three protons.
Therefore, the splitting pattern for the methylene proton will be:
\[
N + 1 = 3 + 1 = 4 \text{ peaks}
\]
This means the indicated methylene proton will be split into **four peaks** due to the interaction with the three neighboring protons of the methyl group.
**Correct Answer:**
- four peaks
Understanding this pattern is crucial for interpreting NMR spectra and identifying the structure of organic compounds. This basic principle of spin-spin coupling enables chemists to determine the number of hydrogen atoms and their environments within a molecule.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2084241c-bd3f-4e80-9668-8ab2ad0edb7d%2Fa2307329-4f53-4faa-9bc4-b2a41f7ef093%2Fo5p10ho_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Understanding Spin-Spin Splitting Patterns in the NMR Spectrum of Bromoethane
In this module, we explore the concept of spin-spin splitting patterns in proton NMR spectroscopy, specifically focusing on bromoethane.
**Question:**
In the \( ^1H \) NMR spectrum of bromoethane, the indicated methylene proton (**italicized, red font**) is split into what type of spin-spin splitting pattern?
**Chemical Structure:**
```plaintext
Br
|
H — C — H
|
CH₃
```
**Options:**
- one peak
- two peaks
- three peaks
- four peaks
- five peaks
**Explanation:**
For the given molecule, bromoethane:
- The **methylene group** (–CH₂–) has protons that are adjacent to a **methyl group** (–CH₃).
- According to the N+1 rule in NMR spectroscopy, where N is the number of neighboring protons, the proton in question will split into (N+1) peaks.
- The methyl group (–CH₃) has three protons.
Therefore, the splitting pattern for the methylene proton will be:
\[
N + 1 = 3 + 1 = 4 \text{ peaks}
\]
This means the indicated methylene proton will be split into **four peaks** due to the interaction with the three neighboring protons of the methyl group.
**Correct Answer:**
- four peaks
Understanding this pattern is crucial for interpreting NMR spectra and identifying the structure of organic compounds. This basic principle of spin-spin coupling enables chemists to determine the number of hydrogen atoms and their environments within a molecule.
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