non-reducing sugars have

Options

A. free CHO group and free CO group
B. neither free CO nor free CHO group
C. free CHO and bound CO group
D. free CO group and bound CHO group.

Answer

**Step-by-Step Solution:**

1. **Understanding Reducing and Non-Reducing Sugars:**
- Reducing sugars are those that contain free aldehyde (CHO) or free ketone (CO) groups. These functional groups can be oxidized, allowing the sugar to act as a reducing agent.
- Non-reducing sugars, on the other hand, do not have these free aldehyde or ketone groups.

2. **Identifying Functional Groups:**
- Aldehyde group (CHO) is characterized by the presence of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydrogen atom.
- Ketone group (CO) consists of a carbon atom double-bonded to an oxygen atom and bonded to two other carbon atoms.

3. **Reactivity with Oxidizing Agents:**
- When an oxidizing agent is introduced to reducing sugars, it reacts with the free aldehyde or ketone groups, leading to a chemical reaction.
- Non-reducing sugars lack these reactive groups, meaning they will not undergo such reactions with oxidizing agents.

4. **Conclusion:**
- Therefore, non-reducing sugars have neither free CHO (aldehyde) nor free CO (ketone) groups.

**Final Answer:**
Non-reducing sugars have neither free CHO group nor free CO group.

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