Vapour pressure of chloroform (${\text{CHCl}}_3$) and dichloromethane (${\text{CH}}_2{\text{Cl}}_2$) at $25^{\circ }\text{C}$ are $200\text{mm Hg}$ and $41.5\text{mm Hg}$ respectively. Vapour pressure of the solution obtained by mixing $25.5\text{g}$ of ${\text{CHCl}}_3$ and $40\text{g}$ of ${\text{CH}}_2{\text{Cl}}_2$ at the same temperature will be: (Molecular mass of ${\text{CHCl}}_3=119.5\text{u}$ and molecular mass of ${\text{CH}}_2{\text{Cl}}_2=85\text{u}$)

1. A
   $285.5\text{mm Hg}$
2. B
   $173.9\text{mm Hg}$
3. C
   $615.0\text{mm Hg}$
4. D
   $347.9\text{mm Hg}$