Consider the following solutions: I. 1 M sucrose II. 1 M KCI III. 1 M benzoic acid in benzene IV. 1 M (NH4)3PO4 Which of the following is/are true?

The solutions which have the same osmotic pressure are called isotonic solutions. Osmotic pressure =iCsTwhere i is the van't Hoff factor, c is the concentration of the solute and T is the temperature. In the given four solutions, 'i' is maximum for IV as it has a maximum number of ions. So IV is hypertonic with respect to others and III is hypotonic of I,II and IV