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The IR spectrum below is consistant with which of the following molecules? 0000 Transmitance A B 0.8 0.6 0.4 0.2 A H 3000 INFRARED SPECTRUM OH 2000 Wavenumber (cm-1) B C 1000 .OH OH D

The IR spectrum below is consistant with which of the following molecules? 0000 Transmitance A B 0.8 0.6 0.4 0.2 A H 3000 INFRARED SPECTRUM OH 2000 Wavenumber (cm-1) B C 1000 .OH OH D

Chemistry
Chemistry
10th Edition
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) Spectrum Analysis** *The IR spectrum below is consistent with which of the following molecules?* **IR Spectrum Overview** - **Title**: Infrared Spectrum - **X-axis**: Wavenumber (cm^-1) - **Y-axis**: Transmittance **Transmittance Details** - The transmittance scale ranges from 0.0 to 1.0. - The wavenumber scale ranges from approximately 500 cm^-1 to 4000 cm^-1. **Noteworthy Peaks and Regions:** 1. **Around 3400 cm^-1**: Broad absorption indicating the presence of OH stretching, typical for alcohols or carboxylic acids. 2. **Around 1700 cm^-1**: Sharp absorption suggesting presence of C=O (carbonyl) stretching vibrations. 3. **Overlapping regions between 1600 cm^-1 and 1000 cm^-1**: Multiple peaks indicating possible aromatic ring structures or other functional groups. **Molecular Options** - **A**: Contains an aldehyde group (C=O with adjacent H). - **B**: Contains an alcohol group (OH) and a carbonyl (C=O) group. - **C**: Contains a carboxylic acid group (COOH). - **D**: Contains an alcohol group (OH). **Conclusion** To determine which molecule corresponds with the IR spectrum, observe the functional groups and their corresponding IR peaks: - The broad absorption around 3400 cm^-1 suggests an OH group, which is typical for alcohols or acids. - The sharp absorption around 1700 cm^-1 suggests a carbonyl group (C=O). Given this information: - Molecule **B** contains both an OH and a C=O group. - Molecule **C** contains a COOH group, inclusive of both a carbonyl (C=O) and hydroxyl (OH). Given the data, the IR spectrum most closely resembles molecule **C** (a carboxylic acid), as it has broad OH and sharp C=O peaks, consistent with carboxylic acid spectra.
Transcribed Image Text:**Infrared (IR) Spectrum Analysis** *The IR spectrum below is consistent with which of the following molecules?* **IR Spectrum Overview** - **Title**: Infrared Spectrum - **X-axis**: Wavenumber (cm^-1) - **Y-axis**: Transmittance **Transmittance Details** - The transmittance scale ranges from 0.0 to 1.0. - The wavenumber scale ranges from approximately 500 cm^-1 to 4000 cm^-1. **Noteworthy Peaks and Regions:** 1. **Around 3400 cm^-1**: Broad absorption indicating the presence of OH stretching, typical for alcohols or carboxylic acids. 2. **Around 1700 cm^-1**: Sharp absorption suggesting presence of C=O (carbonyl) stretching vibrations. 3. **Overlapping regions between 1600 cm^-1 and 1000 cm^-1**: Multiple peaks indicating possible aromatic ring structures or other functional groups. **Molecular Options** - **A**: Contains an aldehyde group (C=O with adjacent H). - **B**: Contains an alcohol group (OH) and a carbonyl (C=O) group. - **C**: Contains a carboxylic acid group (COOH). - **D**: Contains an alcohol group (OH). **Conclusion** To determine which molecule corresponds with the IR spectrum, observe the functional groups and their corresponding IR peaks: - The broad absorption around 3400 cm^-1 suggests an OH group, which is typical for alcohols or acids. - The sharp absorption around 1700 cm^-1 suggests a carbonyl group (C=O). Given this information: - Molecule **B** contains both an OH and a C=O group. - Molecule **C** contains a COOH group, inclusive of both a carbonyl (C=O) and hydroxyl (OH). Given the data, the IR spectrum most closely resembles molecule **C** (a carboxylic acid), as it has broad OH and sharp C=O peaks, consistent with carboxylic acid spectra.
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