Which of the following relation is not correct?

Enthalpy, in a thermodynamic system, is the measure of its energy which is equal to the sum of the internal energy and the product of its pressure and volume.

$H = U + PV$ (By definition)

$\Delta H = \Delta U + \Delta\left(PV\right)or\Delta H = \Delta U + V \Delta P + P \Delta V$

at constant pressure

$\Delta H = \Delta U + P \Delta V$ So, option A is incorrect.

$\Delta U = q + W$ First law of thermodynamics.

${\Delta S}_{sys} + {\Delta S}_{surr} \ge 0or{\Delta S}_{Universe} \ge 0$ A form of second law of thermodynamics.

$\Delta G = \Delta H - T \Delta S$ Second law of thermodynamics.