The vapour pressure of three liquids $\mathrm{P}, \mathrm{Q}$ and R , of nearly equal molecular masses is shown as a function of temperature below.


The correct statement is

• A

  The normal boiling points follow the order $\mathrm{P} \gt \mathrm{Q} \gt \mathrm{R}$.
• B

  The variation of pressure with respect to temperature for each liquid is given by $\frac{d P}{d T}=\frac{K}{T^2}$, where $K$ is a constant.
• C

  The strength of intermolecular interactions follows the order $\mathrm{P} \gt \mathrm{Q} \gt \mathrm{R}$.
• Correct answer
  D

  The normal boiling point of Q is close to $65^{\circ} \mathrm{C}$.

Hence, the correct answer is option: 'D'.