NEET 2026 Chemistry, question 74.

A protein undergoes reversible thermal denaturation from its initial state N to denatured state D according to N $\rightleftharpoons$ D. At 60 °C, the concentrations of both N and D are equal at equilibrium, and the standard enthalpy change of denaturation is 666 kJ mol$^{-1}$. The standard entropy change ($\Delta S^\circ$ in kJ K$^{-1}$mol$^{-1}$) of the protein upon denaturation at 60 °C is closest to