Assertion: `R-C -= O^(+)` is more stable than `R- C^(+) = O`.
Reason: Resonance in carbonyl compound provides `C^(+)` and `

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If assertion is false but reason is true

Explanation

To solve the question regarding the stability of the two structures, we will analyze the assertion and reason step by step.

### Step 1: Understanding the Structures
The assertion states that `R-C≡O^+` (Acylium ion) is more stable than `R-C^+=O` (a carbonyl cation).

**Hint:** Identify the structures and their charges. The first structure has a positive charge on carbon, while the second structure has a positive charge on oxygen.

### Step 2: Analyzing Resonance
In carbonyl compounds, resonance plays a crucial role in determining stability. The acylium ion can exhibit resonance, which allows for the delocalization of the positive charge.

**Hint:** Consider how resonance structures can stabilize a molecule by spreading out charge.

### Step 3: Resonance Structures
For the acylium ion (`R-C≡O^+`), the resonance structures can be drawn, showing the positive charge being shared between the carbon and the oxygen. This delocalization contributes to the stability of the ion.

**Hint:** Draw the resonance structures and identify where the positive charge is located in each structure.

### Step 4: Comparing Stability
The stability of a resonance structure can often be assessed by the number of pi bonds and the distribution of charge. The acylium ion has more resonance forms compared to the carbonyl cation, which makes it more stable.

**Hint:** Recall that more resonance structures generally lead to greater stability.

### Step 5: Conclusion
Based on the analysis, we conclude that the assertion is correct: `R-C≡O^+` is indeed more stable than `R-C^+=O`. The reason provided is also correct as resonance in carbonyl compounds contributes to the stability of the acylium ion.

**Hint:** Summarize the findings: both the assertion and reason are true, and the reason correctly explains the assertion.

### Final Answer
Both the assertion and reason are true, and the reason is a correct explanation of the assertion.