Which one is most toxic?

Solution (By Examveda Team)

Out of the given options of pesticides, Dieldrin is the most toxic insecticide and is now banned also due to concerns about their impact on human health. It increases the threat of breast cancer.
Dieldrin was widely used as a pesticide for corn, cotton and citrus crops. It persists in the soil with a half-life of five years at temperate latitudes.