Which of the following is pair of resonance structure?

Options

A.
B.
C.
D.

Explanation

To determine which of the given pairs represents resonance structures, we need to follow these steps:

### Step 1: Understand Resonance Structures
Resonance structures are different ways of drawing the same molecule that show the delocalization of electrons. They typically involve the movement of electrons (not atoms) and can include:
- Shifting of double bonds to form single bonds.
- Shifting of lone pairs to form double bonds.
- The presence of charges (positive or negative) that can be moved around.

### Step 2: Analyze Each Pair
We will analyze each pair of structures provided in the question to see if they meet the criteria for resonance structures.

1. **Identify Bonds and Charges**: Look for double bonds, single bonds, and charges in each structure.
2. **Check Electron Movement**: Determine if you can move electrons around to create a new structure without changing the arrangement of atoms.
3. **Look for Valid Resonance**: Ensure that the new structure maintains the same number of valence electrons and follows the octet rule (where applicable).

### Step 3: Evaluate the Given Options
- For each pair of structures, check if they can be interconverted by moving electrons (not atoms) and if they maintain the same overall charge.
- If a pair shows a shift of electrons that results in a valid structure, then it is a pair of resonance structures.

### Step 4: Conclusion
After evaluating the pairs, we find that option **E** meets the criteria for resonance structures because:
- It involves the movement of electrons between double and single bonds.
- It maintains the overall charge and valence electron count.

### Final Answer
The pair of resonance structures is **E**.

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