Most stable pesticides

Options

A. Organophosphates
B. Organochlorines
C. Bordeaux mixture
D. Azaderectnin

Answer

To determine the most stable pesticides from the given options, we need to analyze each option based on their chemical properties and stability.

### Step-by-Step Solution:

1. **Understanding Pesticides**: Pesticides are chemicals used to kill pests. They can be classified into different categories based on their chemical structure and mode of action.

2. **Analyzing the Options**:
- **Option A: Organophosphates**: These are esters of phosphoric acid and are commonly used as insecticides. However, they are known to be biodegradable, which means they break down in the environment and are not very stable.

- **Option B: Organochlorines**: These are chlorinated hydrocarbons. A well-known example is DDT (Dichloro-Diphenyl-Trichloroethane), which is highly stable and non-biodegradable. This stability allows them to persist in the environment for a long time.

- **Option C: Bordeaux Mixture**: This is a fungicide made from copper sulfate and lime. It is also biodegradable, meaning it does not have long-term stability in the environment.

- **Option D: Azadirachtin**: This is an active compound derived from the neem tree and is used as a natural pesticide. It is biodegradable and thus not very stable.

3. **Conclusion**: Based on the analysis, the most stable pesticide among the options is **Option B: Organochlorines**, specifically due to their non-biodegradable nature, which allows them to remain in the environment for extended periods.

### Final Answer:
The most stable pesticide is **Option B: Organochlorines**.