Chlorpyrifos is an organophosphate insecticide that has been widely used for agricultural and household purposes. However, it is important to note that as of my knowledge cutoff in September 2021, there have been increasing restrictions and bans on the use of chlorpyrifos due to concerns about its potential adverse effects on human health and the environment. Here are some of the properties typically associated with chlorpyrifos:

1. Chemical Composition: Chlorpyrifos, also known by its chemical name O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate, is an organophosphorus compound.

2. Mode of Action: Chlorpyrifos works as a neurotoxic insecticide by inhibiting the enzyme acetylcholinesterase, which disrupts the transmission of nerve impulses in insects.

3. Persistence and Environmental Impact: Chlorpyrifos is known to persist in the environment, which presents a risk of contaminating soil, water sources, and aquatic ecosystems. It can have harmful effects on non-target organisms, including birds, fish, and beneficial insects.

4. Toxicity to Humans: Exposure to chlorpyrifos can pose health risks to humans, especially for those who come into direct contact with the pesticide during its application or handle treated surfaces. Studies have raised concerns about the potential developmental and neurological effects, particularly in children.

5. Regulatory Status: As mentioned earlier, there have been increasing restrictions and bans on the use of chlorpyrifos in several countries and regions. Regulatory actions have been taken based on scientific assessments and concerns regarding its potential risks.