Which one is the poly hydroxy aldehyde or ketone :-

Options

A. Lipid
B. Nucleic acid
C. Carbohydrate
D. Water

Answer

To determine which compound is a polyhydroxy aldehyde or ketone, we need to understand the definitions and characteristics of these compounds:

### Step-by-Step Solution:

1. **Definition of Polyhydroxy Compounds**:
- Polyhydroxy compounds are organic molecules that contain multiple hydroxyl (-OH) groups.

2. **Aldehydes and Ketones**:
- Aldehydes have a terminal carbonyl group (C=O) with the general formula RCHO, where R is a hydrocarbon chain.
- Ketones have a carbonyl group located within the carbon chain, with the general formula RC(=O)R', where R and R' are hydrocarbon chains.

3. **Carbohydrates**:
- Carbohydrates are classified as polyhydroxy aldehydes or ketones. They contain multiple hydroxyl groups and either an aldehyde group (aldoses) or a ketone group (ketoses).
- Examples include glucose (an aldose) and fructose (a ketose).

4. **Identifying Examples**:
- **Aldoses**: Glucose is a common example of a polyhydroxy aldehyde.
- **Ketoses**: Fructose is a common example of a polyhydroxy ketone.

5. **Condensation Products**:
- Carbohydrates can also form condensation products, such as sucrose, which is formed from glucose and fructose.

6. **Conclusion**:
- Based on the definitions and examples, the correct answer to the question of which one is a polyhydroxy aldehyde or ketone is option three, which refers to a carbohydrate such as glucose or fructose.

### Final Answer:
The polyhydroxy aldehyde is glucose (an aldose), and the polyhydroxy ketone is fructose (a ketose).