If deoxyribose sugar is supplemented with oxygen at second carbon atom, which one of these is formed ?

Options

A. Erythrose
B. Heptose
C. Ribulose
D. Ribose

Answer

To solve the question, "If deoxyribose sugar is supplemented with oxygen at the second carbon atom, which one of these is formed?" we can follow these steps:

### Step-by-Step Solution:

1. **Understand Deoxyribose Structure**:
- Deoxyribose is a five-carbon sugar (pentose) that is a component of DNA. Its chemical formula is C5H10O4. The structure has hydroxyl (OH) groups attached to certain carbon atoms.

2. **Identify the Structure of Deoxyribose**:
- The structure of deoxyribose can be represented as follows:
- C1: OH and H
- C2: H and H
- C3: OH and H
- C4: CH2OH
- C5: H and CH2OH

3. **Modification at the Second Carbon**:
- In the question, we are instructed to supplement the second carbon atom with an oxygen atom. This means that instead of having two hydrogen atoms (H and H) at the second carbon, we will replace one of the hydrogen atoms with a hydroxyl group (OH).

4. **Draw the New Structure**:
- After the modification, the new structure will be:
- C1: OH and H
- C2: OH and H (instead of H and H)
- C3: OH and H
- C4: CH2OH
- C5: H and CH2OH

5. **Identify the Resulting Sugar**:
- The new sugar formed after this modification is ribose. Ribose is also a five-carbon sugar but differs from deoxyribose by having an -OH group at the second carbon instead of just hydrogen.

6. **Conclusion**:
- Therefore, if deoxyribose sugar is supplemented with oxygen at the second carbon atom, the resulting sugar is ribose.

### Final Answer:
The correct answer is **ribose**.

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