What will be the major product when `2-`Aminopropane is treated with nitrous acid ?

Options

A. `1-` Propanol
B. `2-` Propanol
C. Propene
D. Cyclopropane

Explanation

To determine the major product when 2-aminopropane is treated with nitrous acid, we can follow these steps:

### Step 1: Identify the Structure of 2-Aminopropane
2-aminopropane has the following structure:
- It is an amine with the formula CH3-CH(NH2)-CH3.
- This means there is an amino group (NH2) attached to the second carbon of a three-carbon chain.

### Step 2: Reaction with Nitrous Acid
When 2-aminopropane is treated with nitrous acid (HNO2), a diazonium salt is formed. The reaction can be represented as follows:
- The amino group (NH2) reacts with nitrous acid to form a diazonium salt (R-N2^+), where R is the rest of the molecule.

### Step 3: Formation of Diazonium Salt
The diazonium salt formed from 2-aminopropane is:
- CH3-CH(N2^+)-CH3 + Cl^-
- Here, the nitrogen from the amino group is replaced by a diazonium group (N2^+).

### Step 4: Decomposition of Diazonium Salt
Diazonium salts are generally unstable, especially when there is no resonance stabilization. Therefore, the diazonium salt will decompose:
- The diazonium salt loses nitrogen gas (N2) and forms a carbocation (R^+).

### Step 5: Formation of the Final Product
The carbocation formed is stabilized by the presence of water (H2O), which provides hydroxide ions (OH^-):
- The carbocation will react with water to form an alcohol.
- The final product is 2-propanol (CH3-CHOH-CH3).

### Conclusion
The major product when 2-aminopropane is treated with nitrous acid is 2-propanol.

### Final Answer:
The major product is 2-propanol.

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