Which among the following will give a precipitate with ammonical silver nitrate

Options

A. 2-butene
B. 2-butyne
C. Chlorobenzene
D. 3-methyl-1-butyne

Answer

To determine which compound will give a precipitate with ammonical silver nitrate, we need to understand the nature of the compounds listed and the reaction involved.

### Step-by-Step Solution:

1. **Understanding Ammonical Silver Nitrate**:
Ammonical silver nitrate is a reagent used to test for terminal alkynes. When terminal alkynes react with ammonical silver nitrate, they form a precipitate of silver acetylide.

2. **Identifying the Compounds**:
Let's analyze the given options:
- **Option 1: 2-butene**: This is a non-terminal alkene. It will not react with ammonical silver nitrate.
- **Option 2: 2-butyne**: This is a non-terminal alkyne. It will also not give a precipitate with ammonical silver nitrate.
- **Option 3: Chlorobenzene**: This is an aromatic compound and does not have a terminal alkyne. Therefore, it will not react with ammonical silver nitrate.
- **Option 4: 3-methyl-1-butene**: This compound contains a terminal double bond but is not a terminal alkyne. However, if we consider the structure, it is actually a terminal alkyne.

3. **Conclusion**:
Among the options, **3-methyl-1-butene** is the compound that will give a precipitate with ammonical silver nitrate due to the presence of a terminal alkyne.

### Final Answer:
The compound that will give a precipitate with ammonical silver nitrate is **3-methyl-1-butene**.