(a) (i)Because bond dissociation enthalpy of H-Cl is lower than HF.(ii) White phosphorus is more reactive than red phosphorus due to discrete tetrahedral structure and angular strain(b) (i)Because bond dissociation enthalpy of H-Cl is higher than HF.(ii) White phosphorus is more reactive than red phosphorus due to discrete trigonal structure and angular strain(c) (i)Because bond dissociation enthalpy of H-Cl is lower than HF.(ii) White phosphorus is more reactive than red phosphorus due to square planar structure and angular strain(d) (i)Because Ionization energy of H-Cl is lower than HF.(ii) White phosphorus is more reactive than red phosphorus due to discrete tetrahedral structure and angular strain