A compound containing one functional group has IR absorption bands at 3300 cm1 (strong, sharp) and 2150 cm¯1. Which substance best matches this information? A) hexan-2-one B) hexan-3-ol C) hex-1-ene D) hexane E) hex-1-yne

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### Infrared (IR) Spectroscopy and Functional Groups

**Problem Statement:**

A compound containing one functional group has IR absorption bands at 3300 cm⁻¹ (strong, sharp) and 2150 cm⁻¹. Which substance best matches this information?

**Options:**

A) hexan-2-one  
B) hexan-3-ol  
C) hex-1-ene  
D) hexane  
E) hex-1-yne  

**Explanation:**

- **IR Absorption Bands:**
  - **3300 cm⁻¹ (strong, sharp):** This band is typically associated with the stretching vibration of an alkyne C-H bond or an N-H bond.
  - **2150 cm⁻¹:** This band commonly matches the C≡C stretching of an alkyne triple bond or C≡N triple bond.

**Correct Answer:**

E) hex-1-yne

The IR absorption at both 3300 cm⁻¹ and 2150 cm⁻¹ aligns with the presence of a terminal alkyne, such as hex-1-yne.
Transcribed Image Text:### Infrared (IR) Spectroscopy and Functional Groups **Problem Statement:** A compound containing one functional group has IR absorption bands at 3300 cm⁻¹ (strong, sharp) and 2150 cm⁻¹. Which substance best matches this information? **Options:** A) hexan-2-one B) hexan-3-ol C) hex-1-ene D) hexane E) hex-1-yne **Explanation:** - **IR Absorption Bands:** - **3300 cm⁻¹ (strong, sharp):** This band is typically associated with the stretching vibration of an alkyne C-H bond or an N-H bond. - **2150 cm⁻¹:** This band commonly matches the C≡C stretching of an alkyne triple bond or C≡N triple bond. **Correct Answer:** E) hex-1-yne The IR absorption at both 3300 cm⁻¹ and 2150 cm⁻¹ aligns with the presence of a terminal alkyne, such as hex-1-yne.
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