Number of carbons in a ring of deoxyribose sugar is

Options

A. Three
B. Four
C. Five
D. Six

Answer

To determine the number of carbons in a ring of deoxyribose sugar, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Deoxyribose Sugar**:
- Deoxyribose is a five-carbon sugar (pentose), which means it has a total of five carbon atoms in its structure.

2. **Identify the Ring Formation**:
- In solution, deoxyribose can form a cyclic structure. This is typically a furanose form, which is a five-membered ring.

3. **Count the Carbons in the Ring**:
- In the cyclic form of deoxyribose, four of the carbon atoms are part of the ring structure. The fifth carbon is usually outside the ring and is attached to a hydroxyl group (OH) or a hydrogen atom.

4. **Conclusion**:
- Therefore, the number of carbon atoms in the ring of deoxyribose sugar is **4**.

### Final Answer:
The number of carbons in a ring of deoxyribose sugar is **4**.

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