Which of the following compounds will give positive test with Tollen's reagent?

Options

A. Acetic acid
B. Acetone
C. Acetamide
D. Acetaldehyde

Answer

To determine which of the given compounds will give a positive test with Tollen's reagent, we need to understand what Tollen's reagent is and which compounds can react with it.

### Step-by-Step Solution:

1. **Understanding Tollen's Reagent**:
Tollen's reagent is an ammoniacal solution of silver nitrate (AgNO3 + NH4OH). It is used to test for the presence of aldehydes.

2. **Identifying Aldehydes**:
Aldehydes are organic compounds that contain the functional group -CHO. They can be oxidized to carboxylic acids, and during this reaction, Tollen's reagent is reduced, resulting in the deposition of metallic silver, which is often referred to as the "silver mirror test."

3. **Analyzing the Given Compounds**:
Let's analyze the given options:
- **Acetic Acid (CH3COOH)**: This is a carboxylic acid and does not contain an aldehyde group. Therefore, it will not give a positive test with Tollen's reagent.
- **Acetone (CH3COCH3)**: This is a ketone and does not contain an aldehyde group. Therefore, it will not give a positive test with Tollen's reagent.
- **Acetamide (CH3CONH2)**: This is an amide and does not contain an aldehyde group. Therefore, it will not give a positive test with Tollen's reagent.
- **Acetaldehyde (CH3CHO)**: This is an aldehyde and contains the -CHO group. Therefore, it will give a positive test with Tollen's reagent.

4. **Conclusion**:
Among the given compounds, only **Acetaldehyde (CH3CHO)** will give a positive test with Tollen's reagent.

### Final Answer:
**Acetaldehyde (CH3CHO)** will give a positive test with Tollen's reagent.

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