A hydrocarbon 'X' on reduction gives 2-methyl butane. On ozonolysis it gives acetone as one of the products. The hydrocarbon is

Options

A. `CH_(3)-CH_(2)-CH=CH_(2)`
B. `CH_(3)-underset(CH_(3))underset(|)(C)=CH-CH_(3)`
C. `CH_(3)-CH_(2)-C-=CH`
D. `CH_(3)-CH=CH-CH_(2)-CH_(3)`

Answer

To solve the problem, we need to identify the hydrocarbon 'X' based on the information given about its reduction and ozonolysis products.

### Step-by-Step Solution:

1. **Understanding the Reduction Product:**
- The hydrocarbon 'X' on reduction gives 2-methylbutane. This means that 'X' must be an alkene or alkyne that, when hydrogen is added (reduction), results in the formation of 2-methylbutane.

2. **Identifying 2-Methylbutane Structure:**
- The structure of 2-methylbutane is:
```
CH3
|
CH3-CH-CH2-CH3
|
CH2
```
- This indicates that 'X' must have a double bond or triple bond that can be reduced to yield this branched alkane.

3. **Understanding the Ozonolysis Product:**
- The hydrocarbon 'X' on ozonolysis gives acetone as one of the products. Acetone has the structure:
```
CH3
|
C=O
|
CH3
```
- This means that one of the products of ozonolysis must include a carbonyl group (C=O) that corresponds to the structure of acetone.

4. **Testing Possible Hydrocarbons:**
- We will now test the given options to see which one fits both conditions (producing 2-methylbutane upon reduction and acetone upon ozonolysis).

**Option 1:** CH3-CH2-CH=CH2 (Butene)
- Reduction gives n-butane (not 2-methylbutane). **Incorrect.**

**Option 2:** CH3-CH=CH-CH3 (2-Butene)
- Reduction gives 2-methylbutane.
- Ozonolysis gives acetone and acetaldehyde. **Correct.**

**Option 3:** CH3-CH2-C≡CH (1-Butyne)
- Reduction gives butene (not 2-methylbutane). **Incorrect.**

**Option 4:** CH3-CH=CH-CH2-CH3 (1-Pentene)
- Reduction gives n-pentane (not 2-methylbutane). **Incorrect.**

5. **Conclusion:**
- The only hydrocarbon that satisfies both conditions is **Option 2: CH3-CH=CH-CH3 (2-Butene)**.

### Final Answer:
The hydrocarbon 'X' is **2-Butene (CH3-CH=CH-CH3)**.

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