The normal boiling point and enthalpy of vaporisation of a liquid X are 400 K and 40 kJ $$\text{mol}^{-1}$$ respectively. Assuming the enthalpy of vaporisation to be constant, which of the following is correct?
I. The entropy of vaporisation is greater than $$100\ \text{J K}^{-1}\text{mol}^{-1}$$ at 400 K and 0.5 atm.
II. It is less than $$100\ \text{J K}^{-1}\text{mol}^{-1}$$ at 400 K and 1 atm.
III. It is less than $$100\ \text{J K}^{-1}\text{mol}^{-1}$$ at 400 K and 2 atm.
IV. It equals $$100\ \text{kJ K}^{-1}\text{mol}^{-1}$$ at 400 K and 1 atm.