Benzene and naphthalene form an ideal solution at room temperature. Which of the following statements is incorrect?
1) The vapor pressure of the solution is equal to the sum of the vapor pressures of benzene and naphthalene
2) The boiling point of the solution is higher than the boiling point of benzene
3) The freezing point of the solution is lower than the freezing point of naphthalene
4) The enthalpy of mixing is zero