The reaction of propane with bromine in presence of UV light predominantly forms

Oxidation state of Cr in potassium dichromate is

What is the volume of unit cell of a metal (at. mass $$25 \mathrm{~g} \mathrm{~mol}^{-1}$$ ) having $$\mathrm{BCC}$$ structure and density $$3 \mathrm{~g} \mathrm{~cm}^{-3}$$ ?

Which among following monomers is used to prepare PVC?