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Which of the following molecules will have some of the characteristics of the IR spectrum below? T% 100 Br 90 or OH 3500 N=C=N 3087 3033 HO HCI 3000 2921 Br 2500 cm-1 1727 2000 oro a

Which of the following molecules will have some of the characteristics of the IR spectrum below? T% 100 Br 90 or OH 3500 N=C=N 3087 3033 HO HCI 3000 2921 Br 2500 cm-1 1727 2000 oro a

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 #### Question: Which of the following molecules will have some of the characteristics of the IR spectrum below? #### IR Spectrum: - **Transmittance (T%) vs. Wavenumber (cm⁻¹) Graph:** - **Peaks Identified:** - **3087 cm⁻¹**: Could indicate the presence of C-H stretches, typical for aromatic compounds or alkenes. - **3033 cm⁻¹**: Another potential C-H stretch, often seen in aromatic hydrocarbon regions. - **2921 cm⁻¹**: Typically corresponds to C-H stretches found in aliphatic compounds. - **1727 cm⁻¹**: Indicative of C=O stretches, commonly found in carbonyl groups such as those in ketones and aldehydes. - The spectrum itself represents a characteristic pattern observed in infrared spectroscopy, used to determine functional groups present within a molecule based on absorption peaks. #### Molecules to Analyze: 1. **Molecule 1:** - Contains a brominated aromatic ring with a carboxylic acid group (Br, C=O, and OH). 2. **Molecule 2:** - Phenol derivative, incorporating a hydroxyl group (OH) on an aromatic ring. 3. **Molecule 3:** - Contains a long aliphatic chain with cyano groups, N=C=N functionality. 4. **Molecule 4:** - An ester with bromoester and phenyl groups, also containing a carbonyl group. 5. **Molecule 5:** - Pyridine derivative, with a possible nitrogen-containing aromatic heterocycle. #### Interpretation: Based on the IR spectrum: - The peak at 1727 cm⁻¹ suggests the presence of a carbonyl group (C=O). - The peaks at 3087 cm⁻¹ and 3033 cm⁻¹ suggest the presence of aromatic C-H stretches. - The peak at 2921 cm⁻¹ is typical of aliphatic C-H stretches. **The molecule most likely matching the IR spectrum is Molecule 4**, which contains both aromatic and ester (carbonyl) features.
Transcribed Image Text:### Infrared (IR) Spectrum Analysis #### Question: Which of the following molecules will have some of the characteristics of the IR spectrum below? #### IR Spectrum: - **Transmittance (T%) vs. Wavenumber (cm⁻¹) Graph:** - **Peaks Identified:** - **3087 cm⁻¹**: Could indicate the presence of C-H stretches, typical for aromatic compounds or alkenes. - **3033 cm⁻¹**: Another potential C-H stretch, often seen in aromatic hydrocarbon regions. - **2921 cm⁻¹**: Typically corresponds to C-H stretches found in aliphatic compounds. - **1727 cm⁻¹**: Indicative of C=O stretches, commonly found in carbonyl groups such as those in ketones and aldehydes. - The spectrum itself represents a characteristic pattern observed in infrared spectroscopy, used to determine functional groups present within a molecule based on absorption peaks. #### Molecules to Analyze: 1. **Molecule 1:** - Contains a brominated aromatic ring with a carboxylic acid group (Br, C=O, and OH). 2. **Molecule 2:** - Phenol derivative, incorporating a hydroxyl group (OH) on an aromatic ring. 3. **Molecule 3:** - Contains a long aliphatic chain with cyano groups, N=C=N functionality. 4. **Molecule 4:** - An ester with bromoester and phenyl groups, also containing a carbonyl group. 5. **Molecule 5:** - Pyridine derivative, with a possible nitrogen-containing aromatic heterocycle. #### Interpretation: Based on the IR spectrum: - The peak at 1727 cm⁻¹ suggests the presence of a carbonyl group (C=O). - The peaks at 3087 cm⁻¹ and 3033 cm⁻¹ suggest the presence of aromatic C-H stretches. - The peak at 2921 cm⁻¹ is typical of aliphatic C-H stretches. **The molecule most likely matching the IR spectrum is Molecule 4**, which contains both aromatic and ester (carbonyl) features.
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