The correct option is A Cl2, ClF3, UF6, ClF
The gases A, B, C and D are Cl2, ClF3, UF6, ClF respectively.
When manganese dioxide is heated with HCl, chlorine gas is obtained.
MnO2+4HClΔ−−−−−−−−→Cl2(g)+MnCl2+2H2O
Chlorine reacts with fluorine to form chlorine trifluoride.
Cl2(g)+3F2(excess)573K−−−−−−−→2ClF3(g)
Chlorine trifluoride reacts with uranium to form uranium hexa fluoride and chlorine mono fluoride.
3ClF3(l)+U(s)⟶UF6(g)+3ClF(g)