Here's why:

* Polarity: Stannic iodide is an ionic compound with a highly polar Sn⁴⁺ and I⁻ ions. Dichloromethane is a relatively nonpolar solvent.

* "Like dissolves like": Generally, polar compounds dissolve best in polar solvents, and nonpolar compounds dissolve best in nonpolar solvents.

* Intermolecular forces: The strong ionic forces holding stannic iodide together are not easily overcome by the weaker dipole-induced dipole interactions that would occur with dichloromethane.

Therefore, stannic iodide would likely form a precipitate in dichloromethane.