Consider the following liquid-vapour equilibrium <br> $Liquid \rightleftharpoons Vapour$ <br> Which of the following relations is correct ?

Question

( A ) $\frac{d \; ln\; P}{dT} = \frac{-\Delta H_v}{RT}$
( B ) $\frac{d \; ln\; G}{dT^2} = \frac{\Delta H_v}{RT^2}$
( C ) $\frac{d \; ln\; P}{dT^2} = \frac{-\Delta H_v}{T^2}$
( D ) $\frac{d \; ln\; P}{dT} = \frac{\Delta H_v}{RT^2}$