Select odd one w.r.t. insecticide.

Options

A. Rotenone
B. Nicotine
C. Azadiractin
D. Devine

Answer

To solve the question "Select odd one w.r.t. insecticide," we will analyze the given options one by one to identify which one does not belong in the category of insecticides.

### Step-by-Step Solution:

1. **Identify the First Option - Rotenone:**
- Rotenone is a naturally occurring compound found in the roots of certain plants.
- It is used as an insecticide due to its ability to kill insects that come into contact with it.
- **Conclusion:** Rotenone is an insecticide.

2. **Identify the Second Option - Nicotine:**
- Nicotine is a chemical compound that can act as a pesticide.
- It is known for its pest-killing properties and is used in various formulations to control insect populations.
- **Conclusion:** Nicotine is also an insecticide.

3. **Identify the Third Option - Azadirachtin:**
- Azadirachtin is derived from the seeds of the neem tree.
- It is widely recognized for its insecticidal properties and is used to control pests in agriculture.
- **Conclusion:** Azadirachtin is an insecticide.

4. **Identify the Fourth Option - D9:**
- D9 is mentioned as not being considered an insecticide.
- It is used for other purposes and does not have the properties associated with insecticides.
- **Conclusion:** D9 is not an insecticide.

### Final Decision:
Based on the analysis, the odd one out with respect to insecticides is **D9**, as it does not function as an insecticide unlike the other three options (Rotenone, Nicotine, and Azadirachtin).