Chlorine kills living cells, bad for any living organism in water, most often damaging fish's sensitive gills as well as the skin that covers their entire bodies.
Definitely bad for compost as it kills all the microbes and little fun guys doing the work.
https://en.wikipedia.org/wiki/Organochlorine_chemistry#Toxic...
incineration might be a bad idea but composting might be fine
if we are talking about https://en.wikipedia.org/wiki/Phthalocyanine_Green_G it's apparently nontoxic enough to use as a tattoo ink so I wouldn't worry about it
this is just another witch-burner who wants to destroy anything they don't understand out of fear
elemental chlorine legitimately is pretty toxic
Your food almost certainly has a compound which contains chlorine too, and makes it taste better.
Chlorine, as chloride, is absolutely necessary for the control of the pH and of the osmotic pressure of the extracellular water contained in the body of animals.
Moreover, chlorine, as chloride, is necessary for the digestion of the food and for killing most of the microbes ingested together with the food (by making acidic the interior of the stomach).
The plants need much less chlorine than the animals, but nonetheless a very small amount of chlorine is absolutely necessary for photosynthesis, being bound in the structure of the Photosystem II, which splits the water, releasing free dioxygen.
[1] ignoring a few technical details.