In the 'H NMR spectrum of bromoethane, the indicated methylene proton (italicized, red font) is split into what type of spin-spin splitting pattern?

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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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.
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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