$K$ value is defined as the ratio of mole fraction of a component in the vapor phase to that in the liquid phase. The $K$ values of propane and iso-butane at $293$ $K$ are given in the table.
| | ${K\ \text{values}}$ |
| $\text{Pressure (kPa)}$ | $\text{Propane}$ | $\text{iso-Butane}$ |
| $1100$ | $1.8$ | $0.85$ |
| $1200$ | $1.6$ | $0.75$ |
| $1300$ | $1.4$ | $0.65$ |
| $1400$ | $1.25$ | $0.5$ |
| $1500$ | $1.1$ | $0.45$ |
Which one of the following is closest to the bubble point pressure (in $\text{kPa}$) of an equimolar mixture of propane and iso-butane at $293$ $K$?
- $1110$
- $1190$
- $1310$
- $1390$
