QUESTION 39 Vitamin C (aka ascorbic acid) has a pka of 4.17. Which proton is responsible? The oxygen atom is numbered 1. OH HO OH OA. The 10 OH on the side chain of atom 5. O B. The OH at atom 3. OC. The OH at atom 4. O D The 20 OH on the side chain of atom 5.

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**Question 39**

Vitamin C (aka ascorbic acid) has a pKa of 4.17. Which proton is responsible? The oxygen atom is numbered 1.

**Structure Analysis:**
The diagram shows the molecular structure of Vitamin C with numbered and labeled atoms. The structure includes several hydroxyl groups (OH) and a lactone ring.

**Answer Options:**

A. The 1º OH on the side chain of atom 5.

B. The OH at atom 3.

C. The OH at atom 4.

D. The 2º OH on the side chain of atom 5.

This question asks which specific hydroxyl group is responsible for the acidity of Vitamin C as represented by its pKa value.
Transcribed Image Text:**Question 39** Vitamin C (aka ascorbic acid) has a pKa of 4.17. Which proton is responsible? The oxygen atom is numbered 1. **Structure Analysis:** The diagram shows the molecular structure of Vitamin C with numbered and labeled atoms. The structure includes several hydroxyl groups (OH) and a lactone ring. **Answer Options:** A. The 1º OH on the side chain of atom 5. B. The OH at atom 3. C. The OH at atom 4. D. The 2º OH on the side chain of atom 5. This question asks which specific hydroxyl group is responsible for the acidity of Vitamin C as represented by its pKa value.
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