Idk what is worse, that or benzene and dioxins

Had a high school science teacher who had a harrowing encounter with

https://en.wikipedia.org/wiki/Trichloroacetic_acid

and usually replacing the Cl -> F makes it worse. (Though there's that weird thing that HF hydrogen bonds itself so strongly that it's a weaker acid than HCl though it makes up for it in danger by being neurotoxic.)