The incorrect statement among the following is:

1. Two different solutions of sucrose of the same molality prepared in different solvents will have the same depression in freezing point.
2. The osmotic pressure of a solution is given by the equation π = CRT (where C is the molarity of the solution)
3. Decreasing order of osmotic pressure for 0.01 M aqueous solutions of BaCl2 > KCl > CH3COOH > sucrose
4. The vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution.