For the expansion occuring from initial to final stage in finite time, which is incorrect?

Options

A. Equilibrium exist in initial and final stage
B. Work obtained is maximum
C. Driving force is much greater than the opposing force
D. Both (1) & (2)

Answer

To solve the question regarding the incorrect statement about the expansion occurring from an initial to a final state in finite time, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding the Process**:
- The question refers to an expansion process that occurs from an initial state to a final state in finite time. This suggests that we are dealing with a real (non-ideal) process, which is typically irreversible.

2. **Option Analysis**:
- **Option A**: "Equilibrium exists in initial and final state."
- In an irreversible process, the system does not pass through equilibrium states during the transition from initial to final states. Therefore, this statement is incorrect for an irreversible process.

- **Option B**: "Work obtained is maximum."
- In irreversible processes, the work done is not maximum; it is actually less than the maximum work that could be obtained in a reversible process. Thus, this statement is also incorrect.

- **Option C**: "Driving force is much greater than the opposing force."
- In irreversible processes, this statement is generally true. The driving force (the force pushing the system towards equilibrium) is indeed greater than the opposing forces (such as friction or resistance). Hence, this statement is correct.

- **Option D**: "Both A and B."
- Since both Option A and Option B are incorrect statements regarding the irreversible process, this option is also correct.

3. **Conclusion**:
- The incorrect statements regarding the expansion process are found in Options A and B. Therefore, the answer to the question is Option B, which states that "Work obtained is maximum."

### Final Answer:
The incorrect option is **B**: "Work obtained is maximum."