Benzylamine and aniline can be distinguish by

Options

A. `HNO_(2)` acid
B. `CHCl_(3)//KOH`
C. `Br_(2)` water
D. Schiff's reagent

Answer

To distinguish between benzylamine and aniline, we can follow these steps:

### Step 1: React with Nitrous Acid
- **Benzylamine** (C6H5CH2NH2) and **aniline** (C6H5NH2) both react with nitrous acid (HNO2).
- When benzylamine is treated with nitrous acid, it forms a very unstable benzyl diazonium salt, which quickly decomposes to give a carbocation. This carbocation can then lose a proton (H+) and form an alcohol.
- In contrast, aniline reacts with nitrous acid to form a stable aniline diazonium salt (C6H5N2+Cl−), which can be further reacted to produce various products.

### Step 2: Analyze the Products
- The product of benzylamine's reaction is an unstable diazonium salt that decomposes, while the product of aniline's reaction is a stable diazonium salt.
- This difference in stability allows us to distinguish between the two amines.

### Step 3: Conclusion
- By observing the reaction with nitrous acid, we can conclude that if a stable diazonium salt is formed, the amine is aniline. If an unstable product is formed that leads to the formation of an alcohol, the amine is benzylamine.

### Final Answer
Thus, benzylamine and aniline can be distinguished by their reaction with nitrous acid, where benzylamine forms an unstable diazonium salt that decomposes, while aniline forms a stable diazonium salt.

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