Benzene is a non polar compound and non-polar solide dissolve in non-polar solvent, and polar so solution dissolve in polar solvent. It means as the polarity of solvent increases the solubility of non-polar solute decreases.
The order of polarity of toluene, bromo benzene and potassium Hydroxide is
Potassium Hydroxide > bromobenzene > tolulene
therefore, the order of solubility of benzene will be---
tolune > bromo benzene > potassium Hydroxide.
