JEE Chemistry 2026 Question with Solution

Given: We must identify which $p$-$V$ graph represents the maximum work done.

Find: The correct option corresponding to the largest work.

For a process, work done is given by

$$W = \int P \, dV$$

So, the magnitude of work is equal to the area under the $P$-$V$ curve. For a cycle, work is the enclosed area.

From the given graphs:

1. Graph 1 has zero enclosed or effective area for work.
2. Graphs 2 and 3 are cyclic paths enclosing comparatively smaller areas.
3. Graph 4 shows expansion from $V$ to $2V$ with pressure decreasing, and the area under this curve down to the volume axis is the largest.

Therefore, the graph representing the maximum work done is Graph 4.

The correct option is D.