Carbonyl fluoride, COF_(2) , is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF_(4)

a) COF2 + H2O -> H2CO3 + F2
b) COF2 + 2HF -> COF4 + H2
c) COF2 + 2H2O -> CO2 + 4HF
d) COF2 + 2HF -> CF4 + 2H2O