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LOD 透过率/% D 12.2 Which compound is consistent with the spectrum shown below? 薄膜法 wp 1500 /cm-¹ 4000 (a) 3000 (b) .OH 2000 HOT (c) OH (d) 1000 NH₂ (e) 500

LOD 透过率/% D 12.2 Which compound is consistent with the spectrum shown below? 薄膜法 wp 1500 /cm-¹ 4000 (a) 3000 (b) .OH 2000 HOT (c) OH (d) 1000 NH₂ (e) 500

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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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### Infrared (IR) Spectroscopy: Compound Identification #### Question 12.2: **Which compound is consistent with the spectrum shown below?** #### Interpretation of the IR Spectrum: The provided IR spectrum is used to identify organic compounds based on their unique absorption patterns. **Axis Information:** - The x-axis represents the **wavenumber (cm<sup>-1</sup>)**, ranging from 4000 to 500 cm<sup>-1</sup>. The wavenumber is inversely proportional to wavelength, and it indicates the frequency at which the molecule absorbs IR light. - The y-axis represents **transmittance (%)**, which ranges from 0 to 100%. High transmittance means low absorption, and low transmittance means high absorption. **Key Features in the Spectrum:** 1. **Broad Peaks around 3200-3600 cm<sup>-1</sup>:** - Indicative of O-H or N-H stretching. 2. **Strong Peak near 1700 cm<sup>-1</sup>:** - Indicative of C=O (carbonyl) stretching. 3. **Multiple Peaks in the Fingerprint Region (1500-500 cm<sup>-1</sup>):** - Useful for identifying specific functional groups and overall match with compounds but generally more complex. #### Compounds to Consider: Below the spectrum, five structural formulas of organic compounds are provided as potential matches: 1. **Compound (a):** An aliphatic compound with a double bond. 2. **Compound (b):** An alcohol. 3. **Compound (c):** A carboxylic acid. 4. **Compound (d):** An amine. 5. **Compound (e):** An ester. #### Analysis: Given the broad peak around 3200-3600 cm<sup>-1</sup>, this suggests the presence of an O-H group or N-H group. The strong peak near 1700 cm<sup>-1</sup> indicates the presence of a carbonyl group (C=O). **Conclusion:** Based on the IR spectrum, the compound is consistent with the presence of both an O-H group (broad peak around 3200-3600 cm<sup>-1</sup>) and a carbonyl group (sharp peak around 1700 cm<sup>-1</sup>). Therefore, the compound most consistent with the spectrum is **Compound
Transcribed Image Text:### Infrared (IR) Spectroscopy: Compound Identification #### Question 12.2: **Which compound is consistent with the spectrum shown below?** #### Interpretation of the IR Spectrum: The provided IR spectrum is used to identify organic compounds based on their unique absorption patterns. **Axis Information:** - The x-axis represents the **wavenumber (cm<sup>-1</sup>)**, ranging from 4000 to 500 cm<sup>-1</sup>. The wavenumber is inversely proportional to wavelength, and it indicates the frequency at which the molecule absorbs IR light. - The y-axis represents **transmittance (%)**, which ranges from 0 to 100%. High transmittance means low absorption, and low transmittance means high absorption. **Key Features in the Spectrum:** 1. **Broad Peaks around 3200-3600 cm<sup>-1</sup>:** - Indicative of O-H or N-H stretching. 2. **Strong Peak near 1700 cm<sup>-1</sup>:** - Indicative of C=O (carbonyl) stretching. 3. **Multiple Peaks in the Fingerprint Region (1500-500 cm<sup>-1</sup>):** - Useful for identifying specific functional groups and overall match with compounds but generally more complex. #### Compounds to Consider: Below the spectrum, five structural formulas of organic compounds are provided as potential matches: 1. **Compound (a):** An aliphatic compound with a double bond. 2. **Compound (b):** An alcohol. 3. **Compound (c):** A carboxylic acid. 4. **Compound (d):** An amine. 5. **Compound (e):** An ester. #### Analysis: Given the broad peak around 3200-3600 cm<sup>-1</sup>, this suggests the presence of an O-H group or N-H group. The strong peak near 1700 cm<sup>-1</sup> indicates the presence of a carbonyl group (C=O). **Conclusion:** Based on the IR spectrum, the compound is consistent with the presence of both an O-H group (broad peak around 3200-3600 cm<sup>-1</sup>) and a carbonyl group (sharp peak around 1700 cm<sup>-1</sup>). Therefore, the compound most consistent with the spectrum is **Compound
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