An unknown has the formula C6H12O. The IR spectrum of this substance has a strong vibration near 1700 cm¯1 . Which structure below is consistent with these data? OH II A) I B)I| II C) II IV D) IV

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**Question:**

An unknown has the formula C₆H₁₂O. The IR spectrum of this substance has a strong vibration near 1700 cm⁻¹.  
Which structure below is consistent with these data?

**Options:**

Structures I, II, III, and IV are shown, each within a box.

- **I:** A linear structure featuring an alcohol group (-OH).

- **II:** Contains a carbonyl group (C=O) with branching.

- **III:** A cyclic structure with a carbonyl group (C=O) as part of a five-membered ring.

- **IV:** A cyclic structure with an alcohol group (-OH) in a five-membered ring.

**Choices:**

A) I  
B) II  
C) III  
D) IV

---

**Explanation:**

The IR spectrum indication of a strong vibration near 1700 cm⁻¹ suggests the presence of a carbonyl group (C=O), which is typically consistent with options II and III.
Transcribed Image Text:**Question:** An unknown has the formula C₆H₁₂O. The IR spectrum of this substance has a strong vibration near 1700 cm⁻¹. Which structure below is consistent with these data? **Options:** Structures I, II, III, and IV are shown, each within a box. - **I:** A linear structure featuring an alcohol group (-OH). - **II:** Contains a carbonyl group (C=O) with branching. - **III:** A cyclic structure with a carbonyl group (C=O) as part of a five-membered ring. - **IV:** A cyclic structure with an alcohol group (-OH) in a five-membered ring. **Choices:** A) I B) II C) III D) IV --- **Explanation:** The IR spectrum indication of a strong vibration near 1700 cm⁻¹ suggests the presence of a carbonyl group (C=O), which is typically consistent with options II and III.
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