The infrared spectrum of an unknown has two small absorption bands in the 2700-2900 cm-¹ region and a strong peak at 1730 cm-¹. What functional group is in the unknown? A) carboxylic acid B) aromatic hydrocarbon C) ether D) aldehyde E) ketone

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Chapter1: Chemical Foundations
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**Infrared Spectrum Analysis Question**

The infrared spectrum of an unknown compound shows two small absorption bands in the 2700-2900 cm⁻¹ region and a strong peak at 1730 cm⁻¹. Which functional group is present in the unknown compound?

**Options:**

A) Carboxylic Acid

B) Aromatic Hydrocarbon

C) Ether

D) Aldehyde

E) Ketone

---

**Explanation:**

In infrared spectroscopy, specific absorption bands correspond to different functional groups within a molecule. The region around 2700-2900 cm⁻¹ is often associated with C-H stretching vibrations. The strong peak at 1730 cm⁻¹ is indicative of a C=O stretching vibration, which is usually characteristic of carbonyl-containing compounds like aldehydes, ketones, carboxylic acids, and esters. This question is designed to help students practice identifying functional groups based on IR spectral data.
Transcribed Image Text:**Infrared Spectrum Analysis Question** The infrared spectrum of an unknown compound shows two small absorption bands in the 2700-2900 cm⁻¹ region and a strong peak at 1730 cm⁻¹. Which functional group is present in the unknown compound? **Options:** A) Carboxylic Acid B) Aromatic Hydrocarbon C) Ether D) Aldehyde E) Ketone --- **Explanation:** In infrared spectroscopy, specific absorption bands correspond to different functional groups within a molecule. The region around 2700-2900 cm⁻¹ is often associated with C-H stretching vibrations. The strong peak at 1730 cm⁻¹ is indicative of a C=O stretching vibration, which is usually characteristic of carbonyl-containing compounds like aldehydes, ketones, carboxylic acids, and esters. This question is designed to help students practice identifying functional groups based on IR spectral data.
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