To determine which p-V curve represents maximum work done, we need to analyze the area under each curve.$\\$The work done by a gas during expansion or compression is given by the area under the p-V curve.$\\$Let's evaluate each option:$\\$• Option 1: The curve is a closed loop, indicating a cyclic process. The net work done is the area enclosed by the loop.$\\$• Option 2: The curve is a downward-sloping isothermal process. The area under this curve is significant, as it represents work done during expansion.$\\$• Option 3: The curve is a vertical line, indicating no change in volume. Hence, no work is done.$\\$• Option 4: The curve is a steep isothermal process with less area under it compared to Option 2.$\\$The maximum work done corresponds to the largest area under the curve.$\\$Therefore, the correct option is Option 2, which represents the maximum work done.$\\$This corresponds to the given correct option.