Based on solute-solvent interaction, the solute which will be most soluble in n-octane is:

$C_6H_{14}$

The correct answer is Option (1) → $C_6H_{14}$

Core Concept:

“Like dissolves like” — Nonpolar solutes dissolve best in nonpolar solvents due to similar intermolecular forces such as dispersion forces.

n-Octane is a nonpolar solvent.

Option 1: C₆H₁₄ (Hexane)

Correct because hexane is a nonpolar hydrocarbon, just like n-octane. Both interact through weak London dispersion forces, making hexane highly soluble in n-octane.

Option 2: KCl

Incorrect because KCl is an ionic compound and requires strong ion-dipole interactions for dissolution, which a nonpolar solvent like n-octane cannot provide.

Option 3: CH₃CN (Acetonitrile)

Incorrect because it is a polar molecule with strong dipole-dipole interactions, making it less compatible with nonpolar n-octane.

Option 4: CH₃OH (Methanol)

Incorrect because methanol is polar and capable of hydrogen bonding, which cannot be effectively supported by nonpolar n-octane.