Which of following will reacts with `Na // liqNH_(3)` ?

Options

A.
B. `CH_(3)-C-=C-CH_(3)`
C. `CH_(3)-C-=C-H`
D. All

Answer

To determine which of the given compounds will react with sodium in the presence of liquid ammonia (Na / liq NH₃), we need to understand the Birch reduction process. The Birch reduction is a reaction that typically involves the reduction of aromatic compounds and certain unsaturated hydrocarbons.

### Step-by-Step Solution:

1. **Identify the Compounds**: First, we need to identify the compounds provided in the question. Common candidates for Birch reduction include benzene, alkenes, and alkynes.

2. **Understanding Birch Reduction**: The Birch reduction involves the reaction of sodium with an aromatic compound or an alkene/alkyne in liquid ammonia. This reaction leads to the formation of a radical anion, which can then undergo further reactions to yield a reduced product.

3. **Reactivity of Compounds**:
- **Benzene**: Benzene can react with sodium in liquid ammonia. The reaction will lead to the formation of a radical anion, which can then be further reduced to form a diene.
- **Alkenes**: Alkenes can also undergo Birch reduction. The reaction will yield a trans product, and the mechanism involves the formation of a radical anion followed by hydrogenation.
- **Alkynes**: Alkynes can react similarly, leading to the formation of reduced products.

4. **Conclusion**: Based on the above analysis, compounds such as benzene, alkenes, and alkynes will react with sodium in the presence of liquid ammonia. Therefore, the answer to the question is that all of these types of compounds will react.

### Final Answer:
The compounds that will react with `Na / liq NH₃` include benzene, alkenes, and alkynes.