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7. For each of the three IR spectra below, identify at least two functional groups and indicate which molecular structure among those listed best matches the spectrum. A E ОН HO. OH 0.8- 0.6 0.4 0.2 2000 Wavenumber (cm-11 3000 1000

7. For each of the three IR spectra below, identify at least two functional groups and indicate which molecular structure among those listed best matches the spectrum. A E ОН HO. OH 0.8- 0.6 0.4 0.2 2000 Wavenumber (cm-11 3000 1000

Chemistry
Chemistry
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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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**Question 7** For each of the three IR spectra below, identify at least two functional groups and indicate which molecular structure among those listed best matches the spectrum. **Molecular Structures:** - A: Propanone - B: 2-Propanol - C: Diethyl Ether - D: Propanoic Acid - E: Propanal **Infrared (IR) Spectra:** 1. **First Spectrum:** - The graph shows absorption peaks with significant activity around 1700 cm⁻¹ and no broad peaks around 3000 cm⁻¹, indicating the presence of a carbonyl group (C=O). - This spectrum suggests the structure is Propanone (A), which contains a prominent carbonyl group. 2. **Second Spectrum:** - The graph depicts a broad peak around 3300 cm⁻¹, characteristic of an O-H stretch, and peaks indicating C-H bonds in the alkane region. - The broader O-H stretch suggests this is 2-Propanol (B). 3. **Third Spectrum:** - This graph displays a strong absorption around 1700 cm⁻¹ and a broad peak above 2500 cm⁻¹ to 3000 cm⁻¹, indicating a carbonyl group along with an O-H stretch typical of carboxylic acids. - This matches Propanoic Acid (D) given the presence of both functional groups. Each spectrum should be carefully analyzed in the context of characteristic absorption peaks for functional group identification.
Transcribed Image Text:**Question 7** For each of the three IR spectra below, identify at least two functional groups and indicate which molecular structure among those listed best matches the spectrum. **Molecular Structures:** - A: Propanone - B: 2-Propanol - C: Diethyl Ether - D: Propanoic Acid - E: Propanal **Infrared (IR) Spectra:** 1. **First Spectrum:** - The graph shows absorption peaks with significant activity around 1700 cm⁻¹ and no broad peaks around 3000 cm⁻¹, indicating the presence of a carbonyl group (C=O). - This spectrum suggests the structure is Propanone (A), which contains a prominent carbonyl group. 2. **Second Spectrum:** - The graph depicts a broad peak around 3300 cm⁻¹, characteristic of an O-H stretch, and peaks indicating C-H bonds in the alkane region. - The broader O-H stretch suggests this is 2-Propanol (B). 3. **Third Spectrum:** - This graph displays a strong absorption around 1700 cm⁻¹ and a broad peak above 2500 cm⁻¹ to 3000 cm⁻¹, indicating a carbonyl group along with an O-H stretch typical of carboxylic acids. - This matches Propanoic Acid (D) given the presence of both functional groups. Each spectrum should be carefully analyzed in the context of characteristic absorption peaks for functional group identification.
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