The correct option for the value of vapour pressure of a solution at $45º\mathrm{C}$ with benzene to octane in molar ratio $3 : 2$ is:

[At $45°\mathrm{C}$ vapour pressure of benzene is $280 \mathrm{mm} \mathrm{Hg}$ and that of octane is $420 \mathrm{mm} \mathrm{Hg}.$ Assume Ideal gas]

• A

  $160 \mathrm{mm}$ of $\mathrm{Hg}$
• B

  $168 \mathrm{mm}$ of $\mathrm{Hg}$
• Correct answer
  C

  $336 \mathrm{mm}$ of $\mathrm{Hg}$
• D

  $350 \mathrm{mm}$ of $\mathrm{Hg}$

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