Change in internal energy is path independent and depends only on the initial and final states. As the initial and final states in the three processes are same. Therefore, ΔU1=ΔU2=ΔU3 Workdone, W= Area under P−V graph As area under curve 1 > area under curve 2 > area under curve 3 ∴W1>W2>W3 According to first law of thermodynamics, Q=W+ΔU As W1>W2>W3 and ΔU1=ΔU2=ΔU3 ∴Q1>Q2>Q3