Which one of the following statement is not correct?

Options

A. DDT and BHC are not good insecticides because they are highly soluble in water
B. DDT and BHC are not good insecticides because they are absorbed by the soil and contaminate root crops
C. Aldrin is not a good insecticide because it is not biodegradable
D. All the above are incorrect

Explanation

To determine which statement is not correct, we will analyze each statement one by one.

1. **Statement 1**: "DDT and VHC are not good insecticides because they are highly soluble in water."
- This statement is incorrect. DDT (Dichloro-Diphenyl-Trichloroethane) and VHC (Volatile Halogenated Compounds) are actually poorly soluble in water. Their low solubility in water is one of the reasons they are effective as insecticides, as they tend to persist in the environment rather than being washed away.

2. **Statement 2**: "Good insecticide because they are absorbed by the soil and contaminate root crops."
- This statement is misleading. While it is true that some insecticides can be absorbed by soil, it is not a characteristic that makes them "good" insecticides. In fact, contamination of root crops is a negative consequence of their use.

3. **Statement 3**: "Aldrin is not a good insecticide because it is not biodegradable."
- This statement is correct. Aldrin is indeed a persistent organic pollutant and is not biodegradable, which can lead to long-term environmental issues.

4. **Statement 4**: "DDT and VHC are highly soluble in water."
- This statement is incorrect. As mentioned earlier, both DDT and VHC are not highly soluble in water, which is why they can persist in the environment.

Based on this analysis, the statement that is not correct is **Statement 1**: "DDT and VHC are not good insecticides because they are highly soluble in water."

### Step-by-Step Solution:
1. **Identify the statements**: Read through each statement carefully.
2. **Analyze Statement 1**: Check the solubility of DDT and VHC in water. Confirm that they are poorly soluble.
3. **Analyze Statement 2**: Evaluate the implications of soil absorption and contamination of crops.
4. **Analyze Statement 3**: Verify the biodegradability of Aldrin and its implications for its effectiveness as an insecticide.
5. **Analyze Statement 4**: Confirm the solubility of DDT and VHC in water again.
6. **Determine the incorrect statement**: Compare the findings and identify which statement does not hold true.