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. Pentanoic acid LOD 50 D. 4D00 3000 2000 1500 1000 500 HAVENUMBERI TRANSMETTANCEIZI

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### Infrared Spectroscopy Analysis for Pentanoic Acid

#### Objective:
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.

#### Chemical Structure:
- **Compound:** Pentanoic Acid
- **Molecular Formula:** C₅H₁₀O₂

#### IR Spectra Analysis:
The infrared spectrum of Pentanoic Acid is shown in the graph, which plots transmittance (%) against wavenumber (cm⁻¹). 

- **Broad Peak around 2500-3500 cm⁻¹:**
  - **Functional Group:** O-H stretch 
  - **Characteristic of:** Carboxylic acids 
  - **Broadness** due to hydrogen bonding.

- **Sharp Peak near 1700 cm⁻¹:**
  - **Functional Group:** C=O stretch 
  - **Characteristic of:** Carbonyl group (present in carboxylic acids).

- **Smaller Peaks in the Range of 2850-3000 cm⁻¹:**
  - **Functional Group:** C-H stretch 
  - **Characteristic of:** Alkanes.

#### Conclusion:
The IR spectrum displays key peaks that confirm the presence of the carboxylic acid functional group in Pentanoic Acid, namely the O-H and C=O stretches. Additional C-H stretching vibrations are present due to the aliphatic chain. This analysis helps in identifying and confirming the structure of the molecule through its IR spectral features.
Transcribed Image Text:### Infrared Spectroscopy Analysis for Pentanoic Acid #### Objective: 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. #### Chemical Structure: - **Compound:** Pentanoic Acid - **Molecular Formula:** C₅H₁₀O₂ #### IR Spectra Analysis: The infrared spectrum of Pentanoic Acid is shown in the graph, which plots transmittance (%) against wavenumber (cm⁻¹). - **Broad Peak around 2500-3500 cm⁻¹:** - **Functional Group:** O-H stretch - **Characteristic of:** Carboxylic acids - **Broadness** due to hydrogen bonding. - **Sharp Peak near 1700 cm⁻¹:** - **Functional Group:** C=O stretch - **Characteristic of:** Carbonyl group (present in carboxylic acids). - **Smaller Peaks in the Range of 2850-3000 cm⁻¹:** - **Functional Group:** C-H stretch - **Characteristic of:** Alkanes. #### Conclusion: The IR spectrum displays key peaks that confirm the presence of the carboxylic acid functional group in Pentanoic Acid, namely the O-H and C=O stretches. Additional C-H stretching vibrations are present due to the aliphatic chain. This analysis helps in identifying and confirming the structure of the molecule through its IR spectral features.
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