Which of the following reagents will be able to disguish between allyl bromide and `n-` propyl bromide?

Options

A. Aqueous `AgNO_(3)`
B. `NaOH, AgNO_(3)`
C. `Alk. KMnO_(4)`
D. Tollens reagent

Explanation

To distinguish between allyl bromide and n-propyl bromide, we can use different reagents. Here’s a step-by-step solution to identify the reagent that can effectively differentiate between the two compounds:

### Step 1: Understand the Structures
- **Allyl bromide** has the structure: CH2=CH-CH2Br
- **n-Propyl bromide** has the structure: CH3-CH2-CH2Br

### Step 2: Identify the Reactivity with Aqueous AgNO3
- When both allyl bromide and n-propyl bromide are treated with **aqueous AgNO3**, they will both react to form a yellow precipitate of AgBr. Therefore, this reagent cannot distinguish between the two compounds.

### Step 3: Test with Alkaline KMnO4 (Baeyer’s Reagent)
- **Alkaline KMnO4** (Baeyer’s reagent) can be used to test for unsaturation (double bonds).
- **Allyl bromide** will react with alkaline KMnO4, resulting in the formation of a diol and the decolorization of the purple color of KMnO4.
- **n-Propyl bromide** does not have a double bond and will not react with alkaline KMnO4, so there will be no color change.

### Step 4: Conclusion
- Since alkaline KMnO4 reacts with allyl bromide but not with n-propyl bromide, it can be used to distinguish between the two compounds.

### Step 5: Evaluate Other Reagents
- **Tollen's reagent** (ammoniacal AgNO3) does not react with either compound, thus it cannot be used for differentiation.

### Final Answer
The reagent that can distinguish between allyl bromide and n-propyl bromide is **alkaline KMnO4 (Baeyer’s reagent)**.

---