1. For following IR spectra: A. Identify the functional groups and bond types present in the molecule. B. Label peaks in the IR spectra below. ACETALDEHYDE CH,0 LO0 4000 3000 2000 1500 1000 500 KAVENUMBERI -1l TRANSMETTANCEI
1. For following IR spectra: A. Identify the functional groups and bond types present in the molecule. B. Label peaks in the IR spectra below. ACETALDEHYDE CH,0 LO0 4000 3000 2000 1500 1000 500 KAVENUMBERI -1l TRANSMETTANCEI
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
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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### IR Spectroscopy Analysis
**1. For the following IR spectra:**
**A. Identify the functional groups and bond types present in the molecule.**
**B. Label peaks in the IR spectra below.**
#### Graph Description and Explanation
**Compound:** Acetaldehyde, C₂H₄O
**IR Spectrum Analysis:**
- **Graph Axes:**
- Y-axis represents transmittance (%).
- X-axis represents wavenumber (cm⁻¹), ranging from 4000 to 500 cm⁻¹.
**Key Features of the Spectrum:**
- **O–H Stretch:** Broad peak around 3200-3600 cm⁻¹ (if present).
- **C=O Stretch:** Strong peak typically between 1700-1750 cm⁻¹, indicative of a carbonyl group (C=O).
- **C–H Stretch (Aldehyde, sp²):** Peaks around 2700-2800 cm⁻¹.
- **C–H Stretch (Alkane, sp³ hybridized):** Multiple peaks usually found around 2850-2960 cm⁻¹.
- **Fingerprint Region (Complex Pattern):** Found between 600-1500 cm⁻¹. This region contains many peaks that can be used to identify particular bonding patterns and functional groups such as C–C, C–O, and other single-bonded interactions.
**Example Analysis for Acetaldehyde:**
1. **Presence of a Carbonyl Group (C=O):** Strong peak expected near 1700-1750 cm⁻¹.
2. **Aldehyde C–H Stretch:** Observed between 2700-2800 cm⁻¹, characteristic of the aldehyde hydrogen.
3. **C–H Stretching (sp³):** Series of peaks around 2900 cm⁻¹.
**Note:** This spectrum specifically represents Acetaldehyde; hence, visible peaks correlate closely with its known functional groups.
**Additional Information:**
- The graph provides insights crucial for identifying molecular structures through their unique infrared absorption patterns.
- To accurately identify all functional groups, the fingerprint region between 600 and 1500 cm⁻¹ should be carefully analyzed, as it contains many distinguishing peaks.
---
### Learning Objectives:
- Understand and interpret infrared spectroscopy
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