One particle is observed in solution
Molecular substances do not dissociate into ions in solution.
A molecular substance is any substance that is formed by a covalent bond. These covalent substances do not dissociate into ions because they are not composed of ions. Only electrovalent or ionic substances are composed of ions.
CH3OH is a molecular substance. It is soluble in water because the polar O-H bond interacts with water via hydrogen bonding. However, it does not dissociate in solution hence only one particle is observed in solution.
The properties that depend on the number of particles in solution are known as colligative properties. For more about colligative properties, see:
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