Consider the following liquid-vapour equilibrium.

Liquid $\rightleftharpoons$ Vapour

Which of the following relations is correct?

(a) ${d \ln P \over dT^2}={-\Delta H_v \over T^2}$

(b) ${d \ln P \over dT}={\Delta H_v \over RT^2}$

(c) ${d \ln G \over dT^2}={\Delta H_v \over RT^2}$

(d) ${d \ln P \over dT}={-\Delta H_v \over RT}$

Liquid $\rightleftharpoons$ Vapour

Which of the following relations is correct?

(a) ${d \ln P \over dT^2}={-\Delta H_v \over T^2}$

(b) ${d \ln P \over dT}={\Delta H_v \over RT^2}$

(c) ${d \ln G \over dT^2}={\Delta H_v \over RT^2}$

(d) ${d \ln P \over dT}={-\Delta H_v \over RT}$