Which one of the following on oxidation will not give a carboxylic acid with the same number of carbon atoms ?

Options

A. `CH_(3)COCH_(3)`
B. `C Cl_(3)CH_(2)CHO`
C. `CH_(3)CH_(2)CH_(2)OH`
D. `CH_(3)CH_(2)CHO`

Answer

To solve the question "Which one of the following on oxidation will not give a carboxylic acid with the same number of carbon atoms?", we need to analyze the oxidation behavior of various organic compounds.

### Step-by-Step Solution:

1. **Identify the Compounds**:
We need to consider the compounds given in the options. The question likely includes aldehydes, ketones, and alcohols.

2. **Understand Oxidation of Alcohols**:
Alcohols can be oxidized to aldehydes or carboxylic acids. For example, a primary alcohol will oxidize to an aldehyde and then further oxidize to a carboxylic acid, maintaining the same number of carbon atoms.

3. **Understand Oxidation of Aldehydes**:
Aldehydes can be oxidized to carboxylic acids. For instance, if we take a 2-carbon aldehyde (ethanal), it will oxidize to acetic acid (also 2 carbons).

4. **Understand Oxidation of Ketones**:
Ketones, however, do not oxidize to carboxylic acids with the same number of carbon atoms. Instead, they can undergo oxidative cleavage under vigorous conditions, leading to smaller carboxylic acids. For example, acetone (a ketone) can be oxidized to produce acetic acid and formic acid, which do not retain the same number of carbon atoms as acetone.

5. **Conclusion**:
Based on the above analysis, the compound that will not give a carboxylic acid with the same number of carbon atoms upon oxidation is acetone (a ketone).

Thus, the correct answer is **A) Acetone**.