Label the major peaks in each spectrum and propose a structure for the compound.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Label the major peaks in each spectrum and propose a structure for the compound.
 
**Molar Mass Analysis and Spectroscopy**

### Overview:

This document provides an analysis of a chemical compound with a molar mass of 120. It includes an infrared (IR) spectrum, a proton nuclear magnetic resonance (¹H NMR) spectrum, and a carbon nuclear magnetic resonance (¹³C NMR) spectrum. These spectroscopic methods are essential for determining the structure and functional groups present in the compound.

### IR Spectrum:

- **Range:** 4000 cm⁻¹ to 500 cm⁻¹
- **Key Peaks and Annotations:**
  - **~3300 cm⁻¹:** Presence of sp³ C-H bonds.
  - **~3000 cm⁻¹:** Presence of sp² C-H bonds.
  - **~1500 cm⁻¹:** Indicative of C=C stretching, possibly aromatic in nature.
  - **Overtone region noted, possibly due to aromatic overtones.**

### ¹H NMR Spectrum:

- **Key Peaks:**
  - **7 to 8 ppm (5H):** Indicative of aromatic protons.
  - **1 to 2 ppm (6H):** Signal likely corresponds to a CH₃-CH₂- group.
  - **Broad signal near 1 ppm (1H):** Could be due to a CH-X group where X is a heteroatom.

### ¹³C NMR Spectrum:

- **Key Peaks:**
  - **120 to 140 ppm (Aromatic region):** Presence of aromatic carbons.
  - **0 to 50 ppm (SP³ region):** Signals corresponding to sp³ hybridized carbons.
  - Annotations indicate potential assignments, with carbons numbered as 1 through 4.

### Interpretation:

The spectra suggest the presence of aromatic characteristics likely due to a benzene ring structure, as indicated by the distinct signals in both the IR and NMR spectra. The presence of sp³ and sp² hybridized carbons suggests alkyl substituents bound to the aromatic ring.

This comprehensive spectroscopic data allows for a deeper understanding of the molecular structure, aiding in further chemical characterization and research applications.
Transcribed Image Text:**Molar Mass Analysis and Spectroscopy** ### Overview: This document provides an analysis of a chemical compound with a molar mass of 120. It includes an infrared (IR) spectrum, a proton nuclear magnetic resonance (¹H NMR) spectrum, and a carbon nuclear magnetic resonance (¹³C NMR) spectrum. These spectroscopic methods are essential for determining the structure and functional groups present in the compound. ### IR Spectrum: - **Range:** 4000 cm⁻¹ to 500 cm⁻¹ - **Key Peaks and Annotations:** - **~3300 cm⁻¹:** Presence of sp³ C-H bonds. - **~3000 cm⁻¹:** Presence of sp² C-H bonds. - **~1500 cm⁻¹:** Indicative of C=C stretching, possibly aromatic in nature. - **Overtone region noted, possibly due to aromatic overtones.** ### ¹H NMR Spectrum: - **Key Peaks:** - **7 to 8 ppm (5H):** Indicative of aromatic protons. - **1 to 2 ppm (6H):** Signal likely corresponds to a CH₃-CH₂- group. - **Broad signal near 1 ppm (1H):** Could be due to a CH-X group where X is a heteroatom. ### ¹³C NMR Spectrum: - **Key Peaks:** - **120 to 140 ppm (Aromatic region):** Presence of aromatic carbons. - **0 to 50 ppm (SP³ region):** Signals corresponding to sp³ hybridized carbons. - Annotations indicate potential assignments, with carbons numbered as 1 through 4. ### Interpretation: The spectra suggest the presence of aromatic characteristics likely due to a benzene ring structure, as indicated by the distinct signals in both the IR and NMR spectra. The presence of sp³ and sp² hybridized carbons suggests alkyl substituents bound to the aromatic ring. This comprehensive spectroscopic data allows for a deeper understanding of the molecular structure, aiding in further chemical characterization and research applications.
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