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The El-MS spectrum below corresponds to which of the following compounds? Relative Intensity 100- 80 9 20 0 25 (A) 40 -H 50 uyumftaftt 75 (B) 100 m/z CN 119 Br- 121 125 -C=C-H (C) 150 Br CN

The El-MS spectrum below corresponds to which of the following compounds? Relative Intensity 100- 80 9 20 0 25 (A) 40 -H 50 uyumftaftt 75 (B) 100 m/z CN 119 Br- 121 125 -C=C-H (C) 150 Br CN

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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
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The answer is D, could someone please explain it

### EI-MS Spectrum Analysis of Compounds #### Objective: Identify the compound that corresponds to the given Electron Ionization-Mass Spectrometry (EI-MS) spectrum from the provided options. #### EI-MS Spectrum: - **Y-axis:** Relative Intensity (%) - **X-axis:** Mass-to-Charge Ratio (m/z) The spectrum features significant peaks at the following m/z values: - **40 (Base Peak)** - **119** - **121** #### Structural Options: Below the spectrum, four chemical structures are provided as potential matches. Each structure lists relevant functional groups and substituents: - **(A)** ![Cl-(CH2)3-C≡C-H](data:image/png;base64) - **(B)** ![Cl-(CH2)3-CN](data:image/png;base64) - **(C)** ![Br-(CH2)2-C≡C-H](data:image/png;base64) - **(D)** ![Br-(CH2)-CN](data:image/png;base64) #### Analysis and Explanation: To determine which compound corresponds to the EI-MS spectrum, consider the following: - **Base Peak (m/z = 40):** This peak likely indicates a stable fragment commonly produced via fragmentation during the ionization process. - **Peaks at m/z = 119 and 121:** The presence of peaks at both 119 and 121 might suggest the presence of isotopes, likely indicating a compound containing Bromine (Br), as Bromine has two major isotopes (79 and 81) with nearly equal natural abundance. Given this information, the compounds containing Bromine (C) and (D) are prime candidates. To differentiate further: - The molecular weights of the fragments and the stability of the ions produced during fragmentation should be assessed. **Conclusion:** Based on isotope consideration and fragment stability, it is more likely that the inclusion of Bromine (Br) associated with distinct isotopic peaks (119 and 121) in (D) corresponds to the spectra presented. Thus, the EI-MS spectrum most likely corresponds to **Compound (D)**: Br-CH2-CN.
Transcribed Image Text:### EI-MS Spectrum Analysis of Compounds #### Objective: Identify the compound that corresponds to the given Electron Ionization-Mass Spectrometry (EI-MS) spectrum from the provided options. #### EI-MS Spectrum: - **Y-axis:** Relative Intensity (%) - **X-axis:** Mass-to-Charge Ratio (m/z) The spectrum features significant peaks at the following m/z values: - **40 (Base Peak)** - **119** - **121** #### Structural Options: Below the spectrum, four chemical structures are provided as potential matches. Each structure lists relevant functional groups and substituents: - **(A)** ![Cl-(CH2)3-C≡C-H](data:image/png;base64) - **(B)** ![Cl-(CH2)3-CN](data:image/png;base64) - **(C)** ![Br-(CH2)2-C≡C-H](data:image/png;base64) - **(D)** ![Br-(CH2)-CN](data:image/png;base64) #### Analysis and Explanation: To determine which compound corresponds to the EI-MS spectrum, consider the following: - **Base Peak (m/z = 40):** This peak likely indicates a stable fragment commonly produced via fragmentation during the ionization process. - **Peaks at m/z = 119 and 121:** The presence of peaks at both 119 and 121 might suggest the presence of isotopes, likely indicating a compound containing Bromine (Br), as Bromine has two major isotopes (79 and 81) with nearly equal natural abundance. Given this information, the compounds containing Bromine (C) and (D) are prime candidates. To differentiate further: - The molecular weights of the fragments and the stability of the ions produced during fragmentation should be assessed. **Conclusion:** Based on isotope consideration and fragment stability, it is more likely that the inclusion of Bromine (Br) associated with distinct isotopic peaks (119 and 121) in (D) corresponds to the spectra presented. Thus, the EI-MS spectrum most likely corresponds to **Compound (D)**: Br-CH2-CN.
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