9. Which below is the keto form? Which below is the enol form? OH OH OH I II III IV

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**Question 9: Identification of Keto and Enol Forms**

**Which below is the keto form?** _______
**Which below is the enol form?** _______

The given image presents four chemical structures labeled I, II, III, and IV. These structures represent different forms of compounds, and the task is to identify the keto and enol forms among them.

### Explanation of Diagrams:

1. **Structure I:**
   - This structure features a five-membered ring with an OH (hydroxyl) group attached to one carbon and a double-bonded oxygen (carbonyl) on the adjacent carbon.
   
2. **Structure II:**
   - This structure also features a five-membered ring but only includes a double-bonded oxygen (carbonyl) attached to one of the carbons without any additional groups at that site.
  
3. **Structure III:**
   - This structure shows a five-membered ring with a hydroxyl (OH) group attached to a carbon with a single bond and no adjacent carbonyl group.
   
4. **Structure IV:**
   - This structure features a five-membered ring with both a hydroxyl (OH) group and a double-bonded oxygen (carbonyl) on adjacent carbons. Additionally, there is a positive charge (+) indicated near the oxygen.

### Answer Key:

**Keto Form:**
The keto form of a compound generally has a carbonyl group (C=O).
- **Structure II** represents the keto form as it has a double-bonded oxygen (carbonyl group).

**Enol Form:**
The enol form of a compound generally has an OH group (hydroxyl) attached directly to a carbon-carbon double bond.
- **Structure I** represents the enol form, featuring both a hydroxyl group and a double-bonded carbon to oxygen within the structure.

Therefore, the answers are:
- **Keto Form:** II
- **Enol Form:** I

This question teaches students about the tautomerism between keto and enol forms, an important concept in organic chemistry involving the structural arrangement of atoms within a molecule.
Transcribed Image Text:**Question 9: Identification of Keto and Enol Forms** **Which below is the keto form?** _______ **Which below is the enol form?** _______ The given image presents four chemical structures labeled I, II, III, and IV. These structures represent different forms of compounds, and the task is to identify the keto and enol forms among them. ### Explanation of Diagrams: 1. **Structure I:** - This structure features a five-membered ring with an OH (hydroxyl) group attached to one carbon and a double-bonded oxygen (carbonyl) on the adjacent carbon. 2. **Structure II:** - This structure also features a five-membered ring but only includes a double-bonded oxygen (carbonyl) attached to one of the carbons without any additional groups at that site. 3. **Structure III:** - This structure shows a five-membered ring with a hydroxyl (OH) group attached to a carbon with a single bond and no adjacent carbonyl group. 4. **Structure IV:** - This structure features a five-membered ring with both a hydroxyl (OH) group and a double-bonded oxygen (carbonyl) on adjacent carbons. Additionally, there is a positive charge (+) indicated near the oxygen. ### Answer Key: **Keto Form:** The keto form of a compound generally has a carbonyl group (C=O). - **Structure II** represents the keto form as it has a double-bonded oxygen (carbonyl group). **Enol Form:** The enol form of a compound generally has an OH group (hydroxyl) attached directly to a carbon-carbon double bond. - **Structure I** represents the enol form, featuring both a hydroxyl group and a double-bonded carbon to oxygen within the structure. Therefore, the answers are: - **Keto Form:** II - **Enol Form:** I This question teaches students about the tautomerism between keto and enol forms, an important concept in organic chemistry involving the structural arrangement of atoms within a molecule.
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