Hyderocarbon`underset(Ni)underset(|)overset(H_2)(.rarr)CH_3-CH_2-CH_3`

Options

A.
B. `H_3C-CH=CH_2`
C. `HC -= C-CH_3`
D. All of these

Answer

To solve the problem, we need to identify the hydrocarbon that, when subjected to hydrogenation in the presence of nickel (Ni), yields propane (CH₃-CH₂-CH₃).

### Step-by-Step Solution:

1. **Understanding Hydrogenation**:
- Hydrogenation is a chemical reaction that involves the addition of hydrogen (H₂) to a compound. It typically occurs in the presence of a catalyst, such as nickel (Ni), palladium (Pd), or platinum (Pt).
- This reaction is commonly used to convert unsaturated hydrocarbons (alkenes or alkynes) into saturated hydrocarbons (alkanes).

2. **Identifying Propane**:
- The product of the hydrogenation reaction is propane, which has the molecular formula C₃H₈ and the structural formula CH₃-CH₂-CH₃.

3. **Finding the Starting Hydrocarbon**:
- To produce propane through hydrogenation, we need to start with a hydrocarbon that has either a double bond (alkene) or a triple bond (alkyne).
- The reaction will convert the double or triple bond into a single bond while adding hydrogen atoms.

4. **Analyzing Possible Hydrocarbons**:
- Let's analyze the options:
- **Option A**: An alkene such as propene (CH₃-CH=CH₂) will yield propane upon hydrogenation.
- **Option B**: An alkyne such as propyne (CH₃-C≡CH) will also yield propane upon hydrogenation.
- **Option C**: Any other alkene or alkyne that can be hydrogenated to form propane.

5. **Conclusion**:
- Since all the hydrocarbons that contain double or triple bonds can be hydrogenated to form propane, the correct answer is that all of these hydrocarbons can produce propane upon hydrogenation.

### Final Answer:
The correct option is **D: All of these**.

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