An unknown compound on ozonolysis to give acid `C_(3)H_(6)O_(2)` and a ketone `C_(4)H_(8)O`. From this information identify structure of unknown compound.

Options

A. `(CH_(3))_(2)C=CHCH_(2)-CH_(2)CH_(3)`
B. `CH_(3)CH_(2)-overset(CH_(3))overset(|)(C )=CHCH_(2)CH_(3)`
C. `(CH_(3))_(2)CHCH=CHCH_(2)CH_(3)`
D. `CH_(3)CH_(2)CH_(2)CH=CHCH_(2)CH_(2)`

Answer

To identify the structure of the unknown compound that gives an acid (C₃H₆O₂) and a ketone (C₄H₈O) upon ozonolysis, we can follow these steps:

### Step 1: Understand Ozonolysis
Ozonolysis is a reaction where ozone (O₃) cleaves double bonds in alkenes, leading to the formation of carbonyl compounds (aldehydes or ketones) and/or carboxylic acids.

### Step 2: Analyze the Products
We know that the ozonolysis of the unknown compound produces:
- An acid with the formula C₃H₆O₂
- A ketone with the formula C₄H₈O

### Step 3: Determine the Structure of the Acid
The acid C₃H₆O₂ can be identified as propanoic acid (CH₃CH₂COOH). This indicates that the ozonolysis must involve a double bond that, when cleaved, results in a three-carbon chain leading to a carboxylic acid.

### Step 4: Determine the Structure of the Ketone
The ketone C₄H₈O can be identified as butanone (CH₃COCH₂CH₃). This indicates that the ozonolysis must also involve a double bond that, when cleaved, results in a four-carbon chain leading to a ketone.

### Step 5: Construct Possible Structures
To find the unknown compound, we need to consider a structure that has both a double bond and can yield both the identified acid and ketone upon ozonolysis.

### Step 6: Testing Possible Structures
Let's analyze the options provided in the video transcript:
1. **Option A**: Yields a ketone with only 3 carbons.
2. **Option B**: Yields both the desired acid (C₃H₆O₂) and ketone (C₄H₈O).
3. **Option C**: Yields aldehydes, not a ketone.
4. **Option D**: Yields aldehydes, not a ketone.

From the analysis, **Option B** is the only one that produces both the required acid and ketone.

### Conclusion
The structure of the unknown compound is represented by **Option B**, which upon ozonolysis gives propanoic acid (C₃H₆O₂) and butanone (C₄H₈O).

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