During delocalization, which statement is INCORRECT :

Options

A. Net charge remains same
B. Number of paired electrons ramains same
C. Number of unpaired electrons remain same
D. Energy of resonating structures always remains same

Answer

To determine which statement is incorrect regarding delocalization, we will analyze the properties of resonance structures and their implications.

### Step-by-Step Solution:

1. **Understanding Delocalization**: Delocalization refers to the distribution of electrons across multiple atoms in a molecule, rather than being localized between two atoms. This often occurs in molecules with conjugated double bonds.

2. **Analyzing Resonance Structures**: Consider a molecule with conjugated double bonds, such as 1,3-butadiene (CH2=CH-CH=CH2). The electrons in the double bonds can shift, creating different resonance forms.

3. **Evaluating the Statements**:
- **Statement 1**: "Net charge remains the same."
- This is true because the total charge in the molecule does not change when resonance occurs. The negative and positive charges can balance each other out.

- **Statement 2**: "Number of paired electrons remains the same."
- This statement is also true. The number of paired electrons does not change during resonance; they are simply redistributed.

- **Statement 3**: "Number of unpaired electrons remains the same."
- This statement is true as well. The number of unpaired electrons does not change during resonance; they remain constant.

- **Statement 4**: "Energy of resonating structures always remains the same."
- This statement is incorrect. The energy of different resonance structures can vary. Generally, more stable resonance forms have lower energy, while less stable forms have higher energy. The energy of the overall resonance hybrid is lower than that of any individual resonance structure.

4. **Conclusion**: The incorrect statement is that "Energy of resonating structures always remains the same."

### Final Answer:
The incorrect statement during delocalization is: "Energy of resonating structures always remains the same."

---