An alkene, `C_(7)H_(14)` on reductive ozonolysis gave propanal and a ketone. The probable ketone is

Options

A. Acetone
B. Ethyl methyl ketone
C. 2-Pentanone
D. 3-Pentanone.

Explanation

To solve the problem, we need to identify the ketone that is produced alongside propanal when the alkene with the formula \( C_7H_{14} \) undergoes reductive ozonolysis. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Structure of the Alkene
The alkene has the molecular formula \( C_7H_{14} \). This indicates that it has a chain of 7 carbon atoms.

**Hint:** Remember that alkenes have at least one double bond, which affects how they react during ozonolysis.

### Step 2: Identify the Products of Reductive Ozonolysis
During reductive ozonolysis, the alkene will break at the double bond and form an aldehyde and a ketone. We know that one of the products is propanal (an aldehyde).

**Hint:** Aldehydes have the functional group -CHO, which is important for identifying the structure.

### Step 3: Determine the Structure of Propanal
Propanal has three carbon atoms and can be represented as:
\[ \text{CH}_3\text{CH}_2\text{CHO} \]
This indicates that the double bond in the original alkene must have been located such that breaking it results in propanal.

**Hint:** The position of the double bond in the alkene is crucial for determining the products of ozonolysis.

### Step 4: Identify the Ketone
Since propanal has three carbon atoms, the remaining four carbon atoms from the original alkene must form a ketone. A ketone has the general structure \( R_2C=O \).

**Hint:** The ketone must have four carbon atoms, so consider possible structures that fit this requirement.

### Step 5: Evaluate Possible Ketones
We need to find a ketone with four carbon atoms. The options typically include:
1. Acetone (3 carbon atoms)
2. Ethyl methyl ketone (4 carbon atoms)
3. 2-Pentanone (5 carbon atoms)
4. 3-Pentanone (5 carbon atoms)

From these options:
- Acetone is not valid since it has only 3 carbon atoms.
- Ethyl methyl ketone (also known as 3-pentanone) has 4 carbon atoms, which fits our requirement.
- 2-Pentanone and 3-Pentanone both have 5 carbon atoms, which do not fit.

**Hint:** Ensure that the ketone you choose has the correct number of carbon atoms as derived from the ozonolysis products.

### Conclusion
The probable ketone formed alongside propanal from the ozonolysis of the alkene \( C_7H_{14} \) is **ethyl methyl ketone**.

**Final Answer:** Ethyl methyl ketone (also known as 3-pentanone).