The chemical compound produced by millipedes for their own defence is

Answer: Option C

The chemical compound produced by millipedes for their defense is Hydrogen cyanide.
Their primary defense mechanisms consist of coiling up and secreting toxins from the sides of their body.
Within these secretions, a variety of irritating chemicals have been identified, some of which include hydrogen cyanide, hydrochloric acid, hydroquinones, benzoquinones, alkaloids, and phenols.