Two moles of `PCl_(5)` were heated at `327^(@)C` in a closed two litre vessel and when equilibrium was reached, `PCl_(5)` was found to be 40% dissociated into `PCl_(3)` and `Cl_(2)`
The equilibrium constant `K_(rho)` for the above reaction is (approx)

Options

A. 13.14 `atm^(-1)`
B. 13.14 atm
C. 6.52 atm
D. 6.52 `atm^(-1)`

Answer

D

Explanation

`-underset(..)overset(..)(O)-CH_(3)` increases the `e^(-)` density in ring due to +M.
`-underset(..)overset(..)(O)-H` increases the `e^(-)` density in ring due to +M.
`-underset(..)overset(..)(O)-overset(O)overset(||)(C)-CH_(3)` increases the `e^(-)` density in ring due to +M.
-CN is a strong `e^(-)` withdrawing group, so it decreases the `e^(-)` density from the ring.