Which of the following will not react with an ammonical silver nitrate solution :

Options

A. `(a)CH_(3)C=CH`
B. (b)`(CH_(3))_(2)CH-C=CH`
C. (c)`CH_(3)C=C CH_(3)`
D. (d)`HC=CH`

Answer

To determine which of the given compounds will not react with ammonical silver nitrate solution (Tollens' reagent), we need to understand the properties of terminal and non-terminal alkynes.

### Step-by-Step Solution:

1. **Understanding Tollens' Reagent**: Tollens' reagent, which is ammonical silver nitrate, is known to react specifically with terminal alkynes. This is because terminal alkynes possess an acidic hydrogen atom that can be replaced by silver ions (Ag⁺) from the reagent.

2. **Identifying Terminal Alkynes**: Terminal alkynes are characterized by having a triple bond at the end of the carbon chain, which allows for the presence of an acidic hydrogen atom. In contrast, internal alkynes do not have this acidic hydrogen as the triple bond is located between two carbon atoms.

3. **Analyzing the Given Compounds**: We need to analyze each of the four compounds provided in the question:
- **Compound A**: A terminal alkyne (e.g., 1-butyne).
- **Compound B**: Another terminal alkyne (e.g., 2-butyne).
- **Compound C**: A terminal alkyne (e.g., 3-pentyne).
- **Compound D**: A non-terminal alkyne (e.g., 2-butyne).

4. **Identifying the Non-Reactive Compound**: Among the compounds, the one that is a non-terminal alkyne will not react with Tollens' reagent. For example, 2-butyne is an internal alkyne and does not have an acidic hydrogen, thus it will not react with ammonical silver nitrate.

5. **Conclusion**: Therefore, the compound that will not react with ammonical silver nitrate solution is the non-terminal alkyne, which is **Compound D** (e.g., 2-butyne).

### Final Answer:
The compound that will not react with ammonical silver nitrate solution is **Compound D** (the non-terminal alkyne).

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