But-2-yne is reduced to trans-but-2-ene using

Options

A. `H_(2)//Ni`
B. Na in liq. `NH_(3)`
C. `H_(2)//Pd-C`
D. Zn in dil. HCI

Explanation

To reduce But-2-yne to trans-but-2-ene, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reaction Type**:
- We are dealing with the reduction of an alkyne (But-2-yne) to an alkene (trans-but-2-ene).

2. **Choose the Appropriate Reducing Agent**:
- To achieve the formation of trans-but-2-ene specifically, we need to select a reducing agent that favors the formation of trans alkenes.

3. **Select the Right Catalyst**:
- For the reduction of alkynes to trans alkenes, we can use **Burt's reduction**, which involves sodium (Na) in liquid ammonia (NH₃).

4. **Write the Reaction**:
- The reaction can be represented as:
\[ \text{But-2-yne} + \text{Na (in liquid NH}_3\text{)} \rightarrow \text{trans-but-2-ene} \]

5. **Conclusion**:
- Therefore, the correct method to reduce But-2-yne to trans-but-2-ene is by using sodium in liquid ammonia.

### Final Answer:
But-2-yne is reduced to trans-but-2-ene using sodium in liquid ammonia (Burt's reduction).

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