Answer : Acetone start to condense below 56 °C
Explanation :
Boiling point : It is defined as the temperature at which vapor pressure of the liquid is equal to the atmospheric pressure of the liquid.
That means, the temperature at which the liquid changes into gas.
Condensation point : It is defined as the temperature at which the phase changes from a gaseous to liquid.
As per question, the boiling point of acetone is 56 °C. As, the gas is at 100 °C then the condensation of acetone will take place at 56 °C but below this temperature acetone exists in a liquid phase.
Hence, below 56 °C acetone start to condense.
