[HandyDandy]

If you were to put a flame to the old r12 you would end up with mustard gas. S’all I’m sayin’. No more, no less.

[LastDayz]

Not chemically possible.

Show me how you get mustard gas bis(2-chloroethyl) sulfide (C₄H₈Cl₂S) from R-12 Dichlorodifluoromethane (CCl2F2) while pulling R-12 vapor through a hose into a burning propane (C₃H₈) flame.