What class of insecticide does Chlorpyriphos belong to?

• A. Organochlorine
• B. Pyrethroid
• C. Organo phosphate
• D. Neonicotinoid

Answer: (C)

Chlorpyrifos is classified as an organophosphate insecticide, which is a group known for its mode of action that disrupts the normal functioning of the nervous system of insects. Organophosphates, like chlorpyrifos, work by inhibiting the enzyme acetylcholinesterase, leading to an accumulation of acetylcholine in the synapses, thus causing paralysis and death in the target insects.

This classification is significant because organophosphates have been widely used in agriculture for their effectiveness against a range of pests. Their chemical structure, which includes phosphorus, is what primarily distinguishes them from other classes such as organochlorines, pyrethroids, or neonicotinoids. Each of those other classes works differently and has distinct characteristics, but chlorpyrifos is firmly within the organophosphate category due to its specific chemical properties and mechanism of action.