Which of the following reagent is used for the following reaction
`CH_3CH_2CH_3rarrCH_3CH_2CHO`

Options

A. Manganese acetate
B. Copper at high temperature and pressure
C. Molybdenum oxide
D. Potassium permanganate

Answer

To determine the reagent used for the conversion of propane (CH₃CH₂CH₃) to propanal (CH₃CH₂CHO), we need to identify the type of reaction taking place. This reaction involves the oxidation of propane to form an aldehyde.

### Step-by-Step Solution:

1. **Identify the Reaction Type**:
The conversion of propane to propanal is an oxidation reaction. In this case, we are converting an alkane (propane) to an aldehyde (propanal).

2. **Select the Appropriate Reagent**:
For the controlled oxidation of alkanes to aldehydes, we need a reagent that can selectively oxidize without further oxidizing the aldehyde to a carboxylic acid.

3. **Consider the Options**:
- **Molybdenum Oxide (MoO₃)**: This reagent is known for its ability to perform controlled oxidation. It can oxidize alkanes to aldehydes without over-oxidizing them to acids.
- **Manganese Acetate**: While it can act as an oxidizing agent, it is not typically used for the direct oxidation of alkanes to aldehydes.
- **Potassium Permanganate (KMnO₄)**: This is a strong oxidizing agent that would oxidize the alkane all the way to a carboxylic acid if not controlled.
- **Copper**: Copper is used in dehydration reactions rather than oxidation of alkanes to aldehydes.

4. **Conclusion**:
The most suitable reagent for the conversion of propane to propanal is **Molybdenum Oxide (MoO₃)**, as it allows for controlled oxidation to produce the desired aldehyde without further oxidation to a carboxylic acid.

### Final Answer:
**Molybdenum Oxide (MoO₃)** is the reagent used for the reaction.