ideal solution obey Raoult's law at all temperature and pressures. The solute-solute and solvent-solvent interactions are similar to solute-solvent interactions. 1. Benzene + Toluene → Ideal solution 2. Chlorobenzene +1, 2-dichlorobenzene → Ideal solution 3. Methyl iodide + Isopropanol → Non-ideal solution 4. Ethyl bromide + Methyl bromide → Ideal solution Hence, only methyl iodide and isopropanol is not an ideal solution.