Question

Why are pentahalides of P, As, Sb and Bi more covalent than their
trihalides?​

Answer 1

Answer:

due to their bond snthalpy

Answer 2

Answer:

pentahalide are More covalent than trihalides this is due to the fact that in pentahalide +5 oxidation state exists while in the case of trihalide +3 oxidation state exists since elements in +5 oxidation state will have More polarising power than in +3 oxidation state the covalent character of bonds is More in pentahalide