Trihalides are less covalent than pentahalides. Justify
Fajan's Rule
In the case of halides, trihalides are less covalent than pentahalides because:
Trihalides
Pentahalides
As a result of the greater polarization of the bond in the pentahalide state as compared to the trihalide state, thus, trihalides are less covalent than pentahalides.