In which delocalisation of positive charge is possible

Options

A.
B.
C.
D.

Explanation

To determine in which delocalization of positive charge is possible, we need to understand the concept of charge delocalization and conjugation in organic compounds. Here’s a step-by-step solution:

### Step 1: Understand Delocalization
Delocalization refers to the distribution of charge over several atoms rather than being localized on a single atom. This is often seen in resonance structures where charges can shift between different atoms.

**Hint:** Look for structures where charge can be shared among multiple atoms.

### Step 2: Identify Conjugation
Conjugation occurs when alternating single and multiple bonds allow for the overlap of p-orbitals, which facilitates the delocalization of electrons. For positive charge delocalization, we need to identify systems with conjugated double bonds.

**Hint:** Check for alternating double and single bonds in the molecular structure.

### Step 3: Analyze the Structures
Examine the given structures to see where the positive charge can shift.
- If a positive charge can move to a neighboring atom through resonance (where a double bond can form and a single bond can break), then delocalization is possible.
- If the resulting structure after shifting the positive charge is stable, then delocalization is favored.

**Hint:** Draw resonance structures to visualize the movement of the positive charge.

### Step 4: Evaluate Stability
When the positive charge is delocalized, check if the resulting structure is stable. Stability is often enhanced when the positive charge is adjacent to electronegative atoms or in a conjugated system.

**Hint:** Consider the stability of the resulting resonance structures. More stable structures contribute more to the resonance hybrid.

### Step 5: Conclusion
After analyzing the structures, conclude which compounds allow for the delocalization of positive charge. The correct answer will be the option where conjugation is possible and the positive charge can be effectively delocalized.

**Hint:** Look for the option that explicitly mentions conjugation and stability of the resulting structures.

### Final Answer
The correct answer is **Option D**: Delocalization of positive charge is possible due to conjugation in the given compounds.