Q. The toxic environmental pollutant dioxin is 44.8% carbon, 1.25% hydrogen and 44.0% chlorine. Its molecular weight is 320±10  What is the molecular formula of dioxin?

1. C10H8O4Cl4
2. C12H6O2Cl4
3. C6H2OCl2
4. C12H4O2Cl4