Choose incorrect option w.r.t. Ethephon.

Options

A. It is an aqueous solution
B. It is used as source of ethylene
C. It is used to hasten fruit ripening in tomatoes and apples
D. It is a natural ripening compound

Answer

To solve the question regarding Ethephon and identify the incorrect option, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ethephon**:
- Ethephon is a plant growth regulator that releases ethylene gas when it decomposes. It is used to promote ripening in fruits.

2. **Analyzing the Options**:
- We need to evaluate the given options to determine which one is incorrect with respect to Ethephon.

3. **Option 1**: "It is an aqueous solution."
- Ethephon is indeed a water-soluble compound. Therefore, this statement is correct.

4. **Option 2**: "It is used as a source of ethylene."
- Ethephon acts as a source of ethylene when it breaks down, which is true. This statement is also correct.

5. **Option 3**: "It is used to hasten food ripening in tomatoes and apples."
- Ethephon is commonly used to accelerate the ripening process in various fruits, including tomatoes and apples. This statement is correct.

6. **Option 4**: "It is a natural ripening compound."
- This statement is incorrect because Ethephon is a synthetic compound derived from ethylene, which is a natural plant hormone. Therefore, this option is the incorrect one.

### Conclusion:
The incorrect option with respect to Ethephon is the fourth option, which states that it is a natural ripening compound.

---