The following two mass spectra represent 1-bromo-4-ethylbenzene and (1-bromoethyl)benzene, respectively. 100 - MS-IU-9451 Spectrum 1 80 - 40 20 - 25 50 75 100 125 150 175 m/z 100 - Spectrum 2 MS-NU-8350 80 - 60 - 40 - 20 - 20 40 60 80 100 120 140 160 180 200 m/z 1. Assign each spectrum to one compound 2. Justify your assignment by assigning relevant signals in each spectrum. 3. Explain how you could determine which spectrum belongs to which compound. Relative Intensity Relative Intensity

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### Mass Spectra Comparison for 1-Bromo-4-ethylbenzene and (1-Bromoethyl)benzene

The following two mass spectra are provided for analysis and comparison. They represent the chemical compounds 1-bromo-4-ethylbenzene and (1-bromoethyl)benzene, respectively. Below are the transcriptions and descriptions of the spectra:

#### Spectrum 1

- **Graph Details:**
  - The x-axis is labeled as "m/z" (mass-to-charge ratio).
  - The y-axis is labeled as "Relative Intensity."
  - Each peak corresponds to a fragment ion, indicating the molecular structure breakpoints.
  - Several prominent peaks are visible, with notable ones at higher m/z values.

#### Spectrum 2

- **Graph Details:**
  - The x-axis is labeled as "m/z" (mass-to-charge ratio).
  - The y-axis is labeled as "Relative Intensity."
  - A dominant peak is present at a lower m/z value compared to Spectrum 1.
  - Additional smaller peaks are distributed along the m/z range.

### Questions for Analysis

1. **Assign each spectrum to one compound.**
   - **Answer this question by considering the molecular structure and fragmentation patterns typical of the given compounds.**

2. **Justify your assignment by assigning relevant signals in each spectrum.**
   - **Identify specific peaks that align with molecular fragments, isotopes, or characteristic groupings of the chemical structures.**

3. **Explain how you could determine which spectrum belongs to which compound.**
   - **Consider unique structural elements like isotopic patterns of bromine, alkyl chain fragmentation, or characteristic m/z values.**

This instructional exercise aims to deepen understanding of mass spectral analysis and molecular structure identification through practical application.
Transcribed Image Text:### Mass Spectra Comparison for 1-Bromo-4-ethylbenzene and (1-Bromoethyl)benzene The following two mass spectra are provided for analysis and comparison. They represent the chemical compounds 1-bromo-4-ethylbenzene and (1-bromoethyl)benzene, respectively. Below are the transcriptions and descriptions of the spectra: #### Spectrum 1 - **Graph Details:** - The x-axis is labeled as "m/z" (mass-to-charge ratio). - The y-axis is labeled as "Relative Intensity." - Each peak corresponds to a fragment ion, indicating the molecular structure breakpoints. - Several prominent peaks are visible, with notable ones at higher m/z values. #### Spectrum 2 - **Graph Details:** - The x-axis is labeled as "m/z" (mass-to-charge ratio). - The y-axis is labeled as "Relative Intensity." - A dominant peak is present at a lower m/z value compared to Spectrum 1. - Additional smaller peaks are distributed along the m/z range. ### Questions for Analysis 1. **Assign each spectrum to one compound.** - **Answer this question by considering the molecular structure and fragmentation patterns typical of the given compounds.** 2. **Justify your assignment by assigning relevant signals in each spectrum.** - **Identify specific peaks that align with molecular fragments, isotopes, or characteristic groupings of the chemical structures.** 3. **Explain how you could determine which spectrum belongs to which compound.** - **Consider unique structural elements like isotopic patterns of bromine, alkyl chain fragmentation, or characteristic m/z values.** This instructional exercise aims to deepen understanding of mass spectral analysis and molecular structure identification through practical application.
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