Which of the following reagents can be used to distinguish Benzaldehdyde from acetophenone?

Options

A. Tollen's reagent
B. Sodium hypoiodite
C. 2,4-Dintrophenyl hydrazine
D. Benedicts solution

Answer

To distinguish between benzaldehyde and acetophenone, we can use specific reagents that react differently with aldehydes and ketones. Here’s a step-by-step solution to the question:

### Step 1: Identify the Compounds
- **Benzaldehyde** is an aromatic aldehyde with the structure C6H5CHO.
- **Acetophenone** is an aromatic ketone with the structure C6H5COCH3.

### Step 2: Understand the Functional Groups
- Aldehydes (like benzaldehyde) have a carbonyl group (C=O) at the end of the carbon chain.
- Ketones (like acetophenone) have a carbonyl group (C=O) within the carbon chain.

### Step 3: Choose the Reagents
To distinguish between benzaldehyde and acetophenone, we need reagents that specifically react with aldehydes or ketones:
1. **Tollens' Reagent**: This reagent is specific for aldehydes. When benzaldehyde is treated with Tollens' reagent, it will reduce the reagent to form a silver mirror, indicating the presence of an aldehyde. Acetophenone, being a ketone, will not react in the same way.

2. **Sodium Hypoiodite (Iodoform Test)**: This reagent is specific for methyl ketones. Acetophenone, which has a methyl group adjacent to the carbonyl, will react to give a yellow precipitate of iodoform (CHI3). Benzaldehyde will not give this reaction since it is not a ketone.

### Step 4: Conclusion
Both **Tollens' reagent** and **Sodium Hypoiodite** can be used to distinguish benzaldehyde from acetophenone:
- **Tollens' reagent** confirms the presence of an aldehyde (benzaldehyde).
- **Sodium Hypoiodite** confirms the presence of a methyl ketone (acetophenone).

### Final Answer
The reagents that can be used to distinguish benzaldehyde from acetophenone are:
- **Tollens' Reagent**
- **Sodium Hypoiodite**

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