* Crystal Structure: A crystal structure is a highly ordered, repeating arrangement of atoms, ions, or molecules in a solid.

Let's analyze each option:

* (1) CaCl2(s): Calcium chloride in its solid state (s) exists as an ionic compound with a highly organized crystal structure.

* (2) C2H6(g): Ethane gas (g) exists as individual molecules with random motion. There is no fixed arrangement of particles in a gas.

* (3) CH3OH( and 8467): This option seems incomplete and doesn't make sense in the context of states of matter.

* (4) CaI2(aq): Calcium iodide in an aqueous solution (aq) exists as dissociated ions surrounded by water molecules. The arrangement is not a fixed crystal structure.

Therefore, the only sample with particles arranged in a crystal structure is CaCl2(s).