How many of the following orders are correct with respect to their properties indicated ?(i) HCl < HF           -            Boiling point(ii) PH3 < NH3           -            Dipole moment(iii) H2O < D2O       -           Strength of Hydrogen bonding(iv) F2 < Cl2            -           Bond energy(v) H2O < OCl2       -            Bond angle(vi) H2O2 < O2F2    -            Bond length of O–O bond(vii) NaCl < CuCl   -             Covalent character.(viii) SO2< SO3      -            Acidic strength