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

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**Educational Website Transcription**

### 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
Transcribed Image Text:**Educational Website Transcription** ### 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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