6 IR: strong peak at 1750cm-1 1H 3+2= 3 PPM 3H 6H

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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**Example Problem: Analysis of NMR Spectrum**

**Chemical Data:**
- **Chemical Formula:** C₅H₁₀O₂
- **IR Spectrum:** Strong peak at 1750 cm⁻¹

**NMR Spectrum Analysis:**

The NMR spectrum presented shows three distinct signals with the following characteristics:

1. **Signal at ~5.0 ppm:**
   - Integration: 1H
   - This peak may correspond to a hydrogen atom in a deshielded environment, possibly near an electronegative atom or group.

2. **Signal at ~2.0 ppm:**
   - Integration: 3H
   - This peak suggests a methyl group (CH₃) possibly adjacent to a carbonyl or other electron-withdrawing group.

3. **Signal at ~1.0 ppm:**
   - Integration: 6H
   - This peak likely represents two equivalent methyl groups, possibly in an alkyl chain or equivalent environment.

**Note:**
The strong IR peak at 1750 cm⁻¹ indicates the presence of a carbonyl group, likely an ester or ketone, which influences the chemical environment of the hydrogen atoms in the molecule.

**Calculation Check:**
- The handwritten note "5×2 = 10 - 10 = 0" suggests a verification of the number of hydrogens in the chemical formula, confirming the spectrum accounts for all hydrogen atoms present.

This analysis can assist in identifying the structure of the compound C₅H₁₀O₂ by combining the NMR and IR data.
Transcribed Image Text:**Example Problem: Analysis of NMR Spectrum** **Chemical Data:** - **Chemical Formula:** C₅H₁₀O₂ - **IR Spectrum:** Strong peak at 1750 cm⁻¹ **NMR Spectrum Analysis:** The NMR spectrum presented shows three distinct signals with the following characteristics: 1. **Signal at ~5.0 ppm:** - Integration: 1H - This peak may correspond to a hydrogen atom in a deshielded environment, possibly near an electronegative atom or group. 2. **Signal at ~2.0 ppm:** - Integration: 3H - This peak suggests a methyl group (CH₃) possibly adjacent to a carbonyl or other electron-withdrawing group. 3. **Signal at ~1.0 ppm:** - Integration: 6H - This peak likely represents two equivalent methyl groups, possibly in an alkyl chain or equivalent environment. **Note:** The strong IR peak at 1750 cm⁻¹ indicates the presence of a carbonyl group, likely an ester or ketone, which influences the chemical environment of the hydrogen atoms in the molecule. **Calculation Check:** - The handwritten note "5×2 = 10 - 10 = 0" suggests a verification of the number of hydrogens in the chemical formula, confirming the spectrum accounts for all hydrogen atoms present. This analysis can assist in identifying the structure of the compound C₅H₁₀O₂ by combining the NMR and IR data.
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