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: Understand the Structure of Hexan-3-one
Hexan-3-one is a ketone with the following structure:
- It has a six-carbon chain (hexane) with a carbonyl group (C=O) located on the third carbon.
- The structural formula can be represented as:
\[ CH_3-CO-CH_2-CH_2-CH_2-CH_3 \]

### Step 2: Identify the Oxidation Process
Ketones are generally resistant to oxidation. However, under certain conditions (high temperature and pressure), they can undergo oxidation. The oxidation of hexan-3-one will lead to the formation of carboxylic acids.

### Step 3: Consider Enolization
During the oxidation process, hexan-3-one can undergo enolization, forming enols. The possible enols from hexan-3-one are:
1. The more stable enol:
\[ CH_3-C(OH)=CH-CH_2-CH_2-CH_3 \]
2. A less stable enol:
\[ CH_2=C(OH)-CH_2-CH_2-CH_3 \]

### Step 4: Identify the Products of Oxidation
When hexan-3-one is oxidized, it can break down to form carboxylic acids. The oxidation will yield:
- Propanoic acid (C3H6O2) from the three-carbon fragment.
- Butanoic acid (C4H8O2) from the four-carbon fragment.

### Step 5: Determine What is Not Present
Since the oxidation of hexan-3-one leads to the formation of propanoic acid and butanoic acid, we need to determine which carboxylic acid is not present in the mixture.

Given that the oxidation of hexan-3-one does not lead to the formation of any carboxylic acid with more than four carbons, we can conclude that:
- Carboxylic acids with more than four carbons (like pentanoic acid or hexanoic acid) are not present in the mixture.

### Final Answer
The mixture of carboxylic acids obtained by the oxidation of hexan-3-one does not contain **pentanoic acid** or any carboxylic acid with more than four carbons.

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