Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Determine the structure based on the following spectrum:
Transcribed Image Text:### Mass Spectrometry Analysis: Identification of Organic Compounds
#### Introduction
Mass spectrometry (MS) is a powerful analytical technique used to identify unknown compounds, determine the structure and chemical properties of molecules, and quantify the amount of a substance. The graph presented here is a mass spectrum, which plots the relative intensity of detected ions against their mass-to-charge ratio (m/z).
#### Description and Analysis of the Mass Spectrum (ID: MS-NW-3528)
The mass spectrum provided displays peaks indicating the presence of ions with specific mass-to-charge (m/z) ratios.
- **X-Axis (m/z):** This axis represents the mass-to-charge ratio of the ions detected.
- **Y-Axis (Relative Intensity):** This axis indicates the relative abundance of each detected ion as a percentage of the most intense ion (base peak).
Key observations:
- A very prominent peak at **m/z 41**, which is the base peak, representing the most stable and abundant ion fragment.
- Several smaller peaks between **m/z 30 and 50**.
- Smaller peaks observed at **m/z 79 and 81**, suggesting the presence of isotopic variants.
- Peaks at higher m/z values around **m/z 120** and higher, though much less intense.
#### Possible Compound Identification
Given this mass spectrum, you are provided with four chemical structure options to identify the unknown compound:
1. **Bromoalkene:**
- Contains a bromine atom.
- Look for peaks corresponding to characteristic bromine isotope patterns (approximately m/z 79 and 81).
2. **Chloroalkane:**
- Includes a chlorine atom.
- Peaks would appear for chlorine isotopes at m/z approx. 35 and 37.
3. **Aminopolyene:**
- Contains an amine group (-NH2) and a polyene structure.
- Multiple peaks due to fragmentation patterns of a polyene chain.
4. **Aromatic Ketone:**
- Comprises a benzene ring and a ketone functional group.
- Look for a peak at m/z 105 (phenyl cation) and other characteristic aromatic fragments.
#### Summary
To identify the compound based on the provided mass spectrum, analyze the peaks and match them with the known fragmentation patterns of the provided chemical structures. Consider isotopic patterns and the molecular weight of each compound to infer the correct match.
**Note:**
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