Mixture of carboxylic acids oblained by the oxidation of hexan-3-one does not contain

Options

A. Methanoic acid
B. Ethanoic acid
C. Propanoic acid
D. Butanoic acid

Answer

To solve the question regarding the mixture of carboxylic acids obtained by the oxidation of hexan-3-one, we will follow these steps:

### Step 1: Identify the Structure of Hexan-3-one
Hexan-3-one is a ketone with the following structure:
\[ \text{CH}_3-\text{CH}_2-\text{C}(\text{O})-\text{CH}_2-\text{CH}_3 \]
This indicates that the carbonyl group (C=O) is located at the third carbon of the hexane chain.

### Step 2: Understand the Oxidation Process
When hexan-3-one is oxidized, it typically undergoes a cleavage reaction. In this case, we will use hot alkaline potassium permanganate (KMnO4) for oxidative cleavage. This reagent can oxidize ketones and lead to the formation of carboxylic acids.

### Step 3: Apply Popov's Rule
According to Popov's rule, during the oxidative cleavage of ketones, the carbonyl group (C=O) will remain with the smaller alkyl group. In this case, we have two sides to consider:
- On one side, we have the ethyl group (CH2CH3).
- On the other side, we have the propyl group (CH2CH2CH3).

### Step 4: Determine the Products
1. If the bond between the carbonyl carbon and the ethyl group is broken, we will get:
- One product: Propanoic acid (CH3CH2COOH)
- The other product will be Butanoic acid (CH3CH2CH2COOH)

2. If the bond between the carbonyl carbon and the propyl group is broken, we will get:
- One product: Ethanoic acid (CH3COOH)
- The other product will be Methanoic acid (HCOOH)

However, since the carbonyl group stays with the smaller alkyl group (ethyl), the products formed will be:
- Propanoic acid
- Butanoic acid

### Step 5: Analyze the Options
Now we will check the options given in the question:
1. Methanoic acid (HCOOH) - **Not formed**
2. Ethanoic acid (CH3COOH) - **Not formed**
3. Propanoic acid (CH3CH2COOH) - **Formed**
4. Butanoic acid (CH3CH2CH2COOH) - **Formed**

### Conclusion
From the analysis, we can conclude that the mixture of carboxylic acids obtained by the oxidation of hexan-3-one does not contain:
- **Methanoic acid** and **Ethanoic acid**.

### Final Answer
The correct answer is that the mixture of carboxylic acids obtained by the oxidation of hexan-3-one does not contain **Methanoic acid**.

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