An alkyne which gives two moles of acetic acid on ozonolysis is -

Options

A. 1-Butyne
B. 2-Butyne
C. Methyl acetylene
D. 3-methyl-1-butyne

Answer

To determine the alkyne that gives two moles of acetic acid upon ozonolysis, we need to analyze the ozonolysis reaction of different alkynes. Here's a step-by-step solution:

### Step 1: Understand Ozonolysis
Ozonolysis is a reaction where ozone (O3) is used to cleave double or triple bonds in organic compounds, resulting in the formation of carbonyl compounds (aldehydes or ketones) or carboxylic acids.

### Step 2: Identify the Alkyne
We need to find an alkyne that, when subjected to ozonolysis, produces two moles of acetic acid (ethanoic acid, CH3COOH).

### Step 3: Analyze Possible Alkynes
1. **1-Butyne (CH3C≡CH)**:
- Ozonolysis of 1-butyne yields:
- CH3C(=O)OH (acetic acid)
- HCOOH (formic acid)
- This does not yield two moles of acetic acid.

2. **2-Butyne (CH3C≡CCH3)**:
- Ozonolysis of 2-butyne yields:
- CH3C(=O)OH (acetic acid)
- CH3C(=O)OH (acetic acid)
- This yields two moles of acetic acid.

3. **3-Methyl-1-butyne (CH3C≡CCH2CH3)**:
- Ozonolysis of 3-methyl-1-butyne yields:
- CH3C(=O)OH (acetic acid)
- HCOOH (formic acid)
- This does not yield two moles of acetic acid.

4. **Methylacetylene (CH3C≡CH)**:
- Ozonolysis of methylacetylene yields:
- CH3C(=O)OH (acetic acid)
- HCOOH (formic acid)
- This does not yield two moles of acetic acid.

### Step 4: Conclusion
The only alkyne that gives two moles of acetic acid upon ozonolysis is **2-butyne (CH3C≡CCH3)**.

### Final Answer:
The alkyne which gives two moles of acetic acid on ozonolysis is **2-butyne**.

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