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5. What is the structure of the compound that gives the following infrared spectrum? mmmm www/m a-Ketone Transmittance %T liquid film 4000 sample 2977 3000 2876 2000 1737 wavanumber cm-1 b- Alcohol c- carboxylic acid d- Aromatic 1500 1166 1000 500

5. What is the structure of the compound that gives the following infrared spectrum? mmmm www/m a-Ketone Transmittance %T liquid film 4000 sample 2977 3000 2876 2000 1737 wavanumber cm-1 b- Alcohol c- carboxylic acid d- Aromatic 1500 1166 1000 500

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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# Infrared Spectroscopy Analysis **Question 5: What is the structure of the compound that gives the following infrared spectrum?** ## Infrared Spectrum Analysis - **Graph Description**: - The graph presented here is an infrared (IR) spectrum, which displays how the infrared light is absorbed by a sample. The x-axis represents the wavenumber (cm⁻¹) and the y-axis indicates the transmittance percentage. - **Key Features**: - A peak at approximately 2977 cm⁻¹, indicating the presence of C-H stretching. - A strong peak around 1737 cm⁻¹, which is characteristic of a carbonyl group (C=O). - Multiple sharp peaks in the region of 1194 cm⁻¹ to 1166 cm⁻¹, suggesting complex fingerprint region absorption. ## Possible Structures: - **a. Ketone** - **b. Alcohol** - **c. Carboxylic Acid** - **d. Aromatic** Given the strong carbonyl absorption at 1737 cm⁻¹, the structure is likely a **ketone**. The presence of the C=O stretching absorption typically indicates ketones or aldehydes. In this case, the absence of O-H stretching excludes alcohols and carboxylic acids. The fingerprint region's complexity can further support aromatic characteristics if overlap exists but is less definitive than the carbonyl stretch for ketones. ---
Transcribed Image Text:# Infrared Spectroscopy Analysis **Question 5: What is the structure of the compound that gives the following infrared spectrum?** ## Infrared Spectrum Analysis - **Graph Description**: - The graph presented here is an infrared (IR) spectrum, which displays how the infrared light is absorbed by a sample. The x-axis represents the wavenumber (cm⁻¹) and the y-axis indicates the transmittance percentage. - **Key Features**: - A peak at approximately 2977 cm⁻¹, indicating the presence of C-H stretching. - A strong peak around 1737 cm⁻¹, which is characteristic of a carbonyl group (C=O). - Multiple sharp peaks in the region of 1194 cm⁻¹ to 1166 cm⁻¹, suggesting complex fingerprint region absorption. ## Possible Structures: - **a. Ketone** - **b. Alcohol** - **c. Carboxylic Acid** - **d. Aromatic** Given the strong carbonyl absorption at 1737 cm⁻¹, the structure is likely a **ketone**. The presence of the C=O stretching absorption typically indicates ketones or aldehydes. In this case, the absence of O-H stretching excludes alcohols and carboxylic acids. The fingerprint region's complexity can further support aromatic characteristics if overlap exists but is less definitive than the carbonyl stretch for ketones. ---
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Given is IR spectrum.

In IR spectrum, each functional group has its unique peak.


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