Acetone will be obtained on ozonolysis of

Options

A. 1-butene
B. 2-butene
C. isobutene
D. butyne

Answer

To determine which compound will yield acetone upon ozonolysis, we need to analyze the ozonolysis products of each given compound. Here’s a step-by-step solution:

### Step 1: Understand Ozonolysis
Ozonolysis is a reaction where alkenes react with ozone (O₃) to form carbonyl compounds (aldehydes or ketones). The double bond in the alkene is cleaved, and the resulting fragments are oxidized to form carbonyl groups.

### Step 2: Analyze Each Compound
We have four compounds to consider: 1-butene, 2-butene, isobutene, and 1-butene.

#### Option A: 1-Butene
1. **Structure**: CH₂=CH-CH₂-CH₃
2. **Ozonolysis Products**:
- Ozonolysis of 1-butene yields propanal (an aldehyde) and formaldehyde.
- **Conclusion**: Does not yield acetone.

#### Option B: 2-Butene
1. **Structure**: CH₃-CH=CH-CH₃
2. **Ozonolysis Products**:
- Ozonolysis of 2-butene yields acetaldehyde (an aldehyde).
- **Conclusion**: Does not yield acetone.

#### Option C: Isobutene
1. **Structure**: (CH₃)₂C=CH₂
2. **Ozonolysis Products**:
- Ozonolysis of isobutene yields acetone (a ketone) and formaldehyde.
- **Conclusion**: Yields acetone.

#### Option D: 1-Pentene
1. **Structure**: CH₂=CH-CH₂-CH₂-CH₃
2. **Ozonolysis Products**:
- Ozonolysis of 1-pentene yields propanoic acid and formic acid.
- **Conclusion**: Does not yield acetone.

### Step 3: Identify the Correct Answer
From the analysis, only isobutene (Option C) produces acetone upon ozonolysis. Therefore, the correct answer is:

**Answer: Isobutene (Option C)**

---