Which of the following hydrocarbons give same product on hydrogenation :

Options

A. `2`-Methyl hex-`1`-ene & `3`-Methyl hex -`3`-ene
B. `3`-Ethyl hex-`1`en-`4`-yne & `2`-Methylhpet-`2`-en-`4`-yne
C. `3`-Ethylcycloprop-`1`-ene & `1,2`-Dimethylcycloprop-`1`-ene
D. `2`-Methylbut-`2`- ene & `3`-Methylbut-`1`-ene

Answer

To determine which hydrocarbons give the same product upon hydrogenation, we will analyze each compound step by step. Hydrogenation involves the addition of hydrogen (H₂) across double or triple bonds in the presence of a catalyst (usually nickel, palladium, or platinum), converting them into single bonds.

### Step-by-Step Solution:

1. **Identify the Hydrocarbons**:
- We have several hydrocarbons to analyze, including:
- 1-methylhex-1-ene
- 3-methylhex-3-ene
- 3-ethylhex-1-ene
- 2-methylhept-2-ene-4-yne
- 3-ethylcycloprop-1-ene
- 1,2-dimethylcycloprop-1-ene
- 2-methylbut-2-ene
- 3-methylbut-1-ene

2. **Draw Structures**:
- For each hydrocarbon, draw the structural formula to visualize the position of double or triple bonds and substituents.

3. **Perform Hydrogenation**:
- **1-methylhex-1-ene**: The double bond at position 1 will convert to a single bond, resulting in a straight-chain alkane with a methyl group at position 1.
- **3-methylhex-3-ene**: The double bond at position 3 will also convert to a single bond, resulting in a straight-chain alkane with a methyl group at position 3.
- **3-ethylhex-1-ene**: The double bond at position 1 will convert to a single bond, resulting in a straight-chain alkane with an ethyl group at position 3.
- **2-methylhept-2-ene-4-yne**: The double bond at position 2 and the triple bond at position 4 will both convert to single bonds, resulting in a straight-chain alkane with a methyl group at position 2.
- **3-ethylcycloprop-1-ene**: The double bond in the cyclopropane will convert to a single bond, resulting in a cyclopropane with an ethyl group.
- **1,2-dimethylcycloprop-1-ene**: The double bond will convert to a single bond, resulting in a cyclopropane with two methyl groups.
- **2-methylbut-2-ene**: The double bond at position 2 will convert to a single bond, resulting in a straight-chain alkane with a methyl group.
- **3-methylbut-1-ene**: The double bond at position 1 will convert to a single bond, resulting in a straight-chain alkane with a methyl group.

4. **Compare Products**:
- After hydrogenation, compare the resulting structures to determine if any of them are identical.
- The key is to look for structural similarities, especially in the arrangement of carbon chains and substituents.

5. **Identify Same Products**:
- Upon analysis, it is found that **2-methylbut-2-ene** and **3-methylbut-1-ene** yield the same product upon hydrogenation, as both result in the same straight-chain alkane structure.

### Conclusion:
The hydrocarbons that give the same product on hydrogenation are **2-methylbut-2-ene** and **3-methylbut-1-ene**.