The relative strength of the interionic/intermolecular forces in decreasing order is:

🧠 The strength of interionic/intermolecular forces decreases as the charge/permanence of the interacting species decreases: ions interact more strongly than permanent dipoles, which interact more strongly than transient dipoles.

🗺️ Decreasing order of force strength:

| Force | Nature of Species | Relative Strength | |-------|------------------|------------------| | Ion–ion | Both species are full charges | Strongest | | Ion–dipole | One full charge, one permanent dipole | Intermediate | | Dipole–dipole | Both permanent dipoles | Weakest of these three |

$\text{Ion–ion} > \text{Ion–dipole} > \text{Dipole–dipole}$

⚡ Note: London (dispersion) forces are generally the weakest of all intermolecular interactions, but they are not in this comparison. Among the three listed, ion–ion is always dominant.

$\boxed{\text{Answer: Ion–ion} > \text{Ion–dipole} > \text{Dipole–dipole}}$