The incorrect expression among the following is :

• A

  For isothermal process ${\mathrm{w}}_{\text{reversible }}=-\mathrm{nRT} \ln \frac{{\mathrm{V}}_{\mathrm{f}}}{{ \mathrm{V}}_{\mathrm{i}}}$
• Correct answer
  B

  $\mathrm{lnK}=\frac{\mathrm{\Delta H}°-\mathrm{T\Delta S}°}{\mathrm{RT}}$
• C

  $\frac{{\mathrm{\Delta G}}_{\text{System }}}{{\mathrm{\Delta S}}_{\text{Total }}}=-\mathrm{T}$ (at constant P)
• D

  $\mathrm{K}={\mathrm{e}}^{-\mathrm{\Delta G}°/\mathrm{RT}}$

Hence, the correct answer is option: 'B'.