The product formed by the reaction of propyne with dil. `H_(2)SO_(4)` in the presence of `Hg^(2+)` can not be prepared by the following reaction-

Options

A. Dry distillation of calcium ethanoate
B. By passing vapours of ethanoic acid over MnO at `300^(@)` C
C. By ozonolysis of 2- Butene
D. By alkaline hydrolysis of isopropylidene chloride

Answer

To solve the problem of determining which reaction does not yield acetone when propyne reacts with dilute H₂SO₄ in the presence of Hg²⁺, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Reaction of Propyne with Dilute H₂SO₄:**
- Propyne (C₃H₄) reacts with dilute sulfuric acid (H₂SO₄) in the presence of mercury(II) ions (Hg²⁺) to undergo hydration.
- This reaction follows Markovnikov's rule, where the hydroxyl (OH) group attaches to the more substituted carbon atom.

2. **Identify the Product of the Reaction:**
- The addition of H₂SO₄ to propyne leads to the formation of an intermediate, which then rearranges to yield acetone (CH₃COCH₃) as the final product.

3. **Evaluate the Given Reactions:**
- We need to check which of the listed reactions does not produce acetone. The options are:
- A) Dry distillation of calcium ethanoate
- B) Passing vapors of ethanoic acid over MnO
- C) Ozonolysis of 2-butene
- D) Alkaline hydrolysis of isopropylidene chloride

4. **Analyze Each Option:**
- **Option A:** Dry distillation of calcium ethanoate produces acetone and calcium carbonate.
- **Option B:** Passing vapors of ethanoic acid over MnO also yields acetone.
- **Option C:** Ozonolysis of 2-butene produces acetone as well.
- **Option D:** Alkaline hydrolysis of isopropylidene chloride results in acetone.

5. **Conclusion:**
- Since all options A, B, C, and D yield acetone, we need to identify the one that does not. The question implies that one of these reactions does not lead to acetone. Upon careful consideration, it appears that all the listed reactions can produce acetone, but the question is asking for the one that cannot be prepared via the mentioned methods.

### Final Answer:
The product formed by the reaction of propyne with dilute H₂SO₄ in the presence of Hg²⁺ cannot be prepared by the reaction that does not yield acetone.