C3H6 (OH) 2 major species present when dissolved in water

Answer: the major species present when C₃H₆ (OH) ₂ is the same molecule.

Explanation:

When solutes dissolve in water there are two possibilities: 1) either the solute dissociate into ions (which is the case of ionic compounds) and the ions are solvated by the solvent, or 2) in the case of covalent compounds the entire molecule is solvated by the molevules of the solvent (water).

The compound C₃H₆ (OH) ₂ (propylene glycol) is a covalent compound, so when dissolved in water it will not dissociate but will remain as a molecule, and that molecules is the species solvated by the molecule of water.