9-What is the structure of the compound that gives the following infrared spectrum? a- Alcohol b- aldehyde c- Ketone d-Alkene e- Carboxylic acid 8 TRANSMITTANCE HIT-NO-1322 ||SCORE= ( BUTYRIC ACID C4H₂O₂ 1 SDBS-NO=1227 IR-NIDA-01956 : LIQUID FILM nam

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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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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Question:**

What is the structure of the compound that gives the following infrared spectrum?

**Options:**
- a) Alcohol
- b) Aldehyde
- c) Ketone
- d) Alkene
- e) Carboxylic acid

**Description:**

The image shows an infrared (IR) spectrum of a compound labeled as butyric acid with the molecular formula C₄H₈O₂. 

**Graph Explanation:**

- **X-axis:** Wavenumber (cm⁻¹), ranging approximately from 4000 to 400 cm⁻¹.
- **Y-axis:** Transmittance (%), ranging from 0 to 100%.

**Key Features in the Spectrum:**

1. **Broad Peak ~3000 cm⁻¹:** This indicates an O-H stretching vibration, characteristic of carboxylic acids.
2. **Sharp Peak ~1700 cm⁻¹:** Represents the C=O stretching vibration, often associated with carboxylic acids and ketones.
3. **Other Peaks:** Additional peaks in the fingerprint region (1500–400 cm⁻¹) indicate C-O stretching and other functional group vibrations typical of carboxylic acids.

**Conclusion:**

Based on the IR spectrum features, the compound is best identified as a carboxylic acid (option e).
Transcribed Image Text:**Question:** What is the structure of the compound that gives the following infrared spectrum? **Options:** - a) Alcohol - b) Aldehyde - c) Ketone - d) Alkene - e) Carboxylic acid **Description:** The image shows an infrared (IR) spectrum of a compound labeled as butyric acid with the molecular formula C₄H₈O₂. **Graph Explanation:** - **X-axis:** Wavenumber (cm⁻¹), ranging approximately from 4000 to 400 cm⁻¹. - **Y-axis:** Transmittance (%), ranging from 0 to 100%. **Key Features in the Spectrum:** 1. **Broad Peak ~3000 cm⁻¹:** This indicates an O-H stretching vibration, characteristic of carboxylic acids. 2. **Sharp Peak ~1700 cm⁻¹:** Represents the C=O stretching vibration, often associated with carboxylic acids and ketones. 3. **Other Peaks:** Additional peaks in the fingerprint region (1500–400 cm⁻¹) indicate C-O stretching and other functional group vibrations typical of carboxylic acids. **Conclusion:** Based on the IR spectrum features, the compound is best identified as a carboxylic acid (option e).
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