Thermodynamics

\(\text { Consider the reversible processes for } 1.0 \mathrm{~mol} \text { of an ideal gas as shown in the figure. }\)

$w_1, w_2, w_3$ and $w_4$ represent work done (in calories) in the processes $1,2,3$ and 4 , respectively; $\Delta U_2$ and $\Delta U_4$ are changes in the internal energy for the processes 2 and 4, respectively.

[use $\mathrm{R}=2 \mathrm{cal} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ ]

The correct option is