Which of the following molecules will show a strong peak in IR around 1750 cm -1 ? CH3 NH₂ 0000 A B CH3 с OH D

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Title: Infrared Spectroscopy: Identifying Functional Groups

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**Question:**
Which of the following molecules will show a strong peak in IR around 1750 cm⁻¹?

**Options:**  
- **A**  
- **B**  
- **C**  
- **D**

**Molecule Structures:**
- **A**: A benzene ring with a carbonyl group (C=O) and a methyl group (CH₃) attached to it.
- **B**: A benzene ring with an amine group (NH₂) attached to it.
- **C**: A benzene ring with a methyl group (CH₃) attached to it.
- **D**: A benzene ring with a hydroxyl group (OH) attached to it.

**Analysis:**
Infrared (IR) spectroscopy is a technique used to identify functional groups in a molecule by measuring the absorption of infrared light. Each functional group has a characteristic absorption range.

A strong peak around 1750 cm⁻¹ is typically indicative of the presence of a carbonyl group (C=O).

**Explanation of Molecule Structures:**
- **Molecule A**: Contains a carbonyl group (C=O), which would show a strong peak around 1750 cm⁻¹.
- **Molecule B**: Contains an amine group (NH₂), which does not absorb around 1750 cm⁻¹.
- **Molecule C**: Contains a methyl group (CH₃), which does not absorb around 1750 cm⁻¹.
- **Molecule D**: Contains a hydroxyl group (OH), which does not absorb around 1750 cm⁻¹.

**Conclusion:**
The molecule that will show a strong peak in IR around 1750 cm⁻¹ is **Molecule A**.

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For further understanding of the IR absorption ranges of various functional groups, students may refer to spectral charts and databases that detail the characteristic absorption frequencies.
Transcribed Image Text:Title: Infrared Spectroscopy: Identifying Functional Groups --- **Question:** Which of the following molecules will show a strong peak in IR around 1750 cm⁻¹? **Options:** - **A** - **B** - **C** - **D** **Molecule Structures:** - **A**: A benzene ring with a carbonyl group (C=O) and a methyl group (CH₃) attached to it. - **B**: A benzene ring with an amine group (NH₂) attached to it. - **C**: A benzene ring with a methyl group (CH₃) attached to it. - **D**: A benzene ring with a hydroxyl group (OH) attached to it. **Analysis:** Infrared (IR) spectroscopy is a technique used to identify functional groups in a molecule by measuring the absorption of infrared light. Each functional group has a characteristic absorption range. A strong peak around 1750 cm⁻¹ is typically indicative of the presence of a carbonyl group (C=O). **Explanation of Molecule Structures:** - **Molecule A**: Contains a carbonyl group (C=O), which would show a strong peak around 1750 cm⁻¹. - **Molecule B**: Contains an amine group (NH₂), which does not absorb around 1750 cm⁻¹. - **Molecule C**: Contains a methyl group (CH₃), which does not absorb around 1750 cm⁻¹. - **Molecule D**: Contains a hydroxyl group (OH), which does not absorb around 1750 cm⁻¹. **Conclusion:** The molecule that will show a strong peak in IR around 1750 cm⁻¹ is **Molecule A**. --- For further understanding of the IR absorption ranges of various functional groups, students may refer to spectral charts and databases that detail the characteristic absorption frequencies.
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