In an isothermal reversible expansion process, ΔU=Cv,ΔT=0 In case of adiabatic wall q = 0 According to 1‌st law of thermodynamics, ΔU=q+W ΔU=Wadiatatic In case of thermal conducting walls ΔU=−q The first law of thermodynamics for close system is, ΔU=q−W Thus, the correct match is II-A, V-B, III-C, I-D