Which of the following conditions does not apply to resonating structures?

Options

A. The contributing structures should have the same or nearly same energies.
B. The contributing structures should be represented such that unlike charges reside on the atoms which are the farthest.
C. The electropositive atom should have positive charge and the electronegative atom the negative charge.
D. The contributing structures must have the same number of unpaired electrons.

Explanation

To solve the question regarding which condition does not apply to resonating structures, we will analyze each option step by step.

### Step 1: Understand Resonating Structures
Resonating structures are different Lewis structures that represent the same molecule or ion, showing the delocalization of electrons. They help illustrate how electrons are distributed in a molecule.

### Step 2: Analyze Each Condition

1. **Condition A**: "The contributing structures should have the same or nearly same energies."
- This condition is **correct**. Resonating structures must have similar energies; otherwise, they would not contribute equally to the resonance hybrid.

2. **Condition B**: "The contributing structures should be represented such that unlike charges reside on the atoms which are farthest."
- This condition is **not correct**. There is no requirement that unlike charges must be on the farthest atoms. This is a misconception, and thus this condition does not apply to resonating structures.

3. **Condition C**: "The electropositive atom should have the positive charge and the electronegative atom should have the negative charge."
- This condition is **correct**. It is more stable for positive charges to be on electropositive atoms and negative charges on electronegative atoms.

4. **Condition D**: "Contributing structures must have the same number of unpaired electrons."
- This condition is **correct**. The number of unpaired electrons must remain consistent across the resonating structures to maintain the same overall electron configuration.

### Conclusion
The only condition that does not apply to resonating structures is **Condition B**.

### Final Answer
**Condition B**: "The contributing structures should be represented such that unlike charges reside on the atoms which are farthest."

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