Which amine yield N-nitroso amine after treatment with nitrous acid `(NaNO_(2),HCl)`?

Options

A.
B.
C.
D.

Explanation

To determine which amine yields N-nitroso amine after treatment with nitrous acid `(NaNO₂, HCl)`, we need to analyze the reactions that occur with different types of amines when treated with nitrous acid.

### Step-by-Step Solution:

1. **Identify the Types of Amines:**
- Amines can be classified into three categories: primary amines (RNH₂), secondary amines (R₂NH), and tertiary amines (R₃N).

2. **Reaction of Primary Amines with Nitrous Acid:**
- When a primary amine (RNH₂) reacts with nitrous acid (NaNO₂ in HCl), it forms a diazonium salt (R₂N⁺Cl⁻). This is not what we are looking for since we need N-nitroso amine.

3. **Reaction of Secondary Amines with Nitrous Acid:**
- When a secondary amine (R₂NH) reacts with nitrous acid, it forms N-nitroso amine (R₂N-NO). This is the desired product in this case.

4. **Reaction of Tertiary Amines with Nitrous Acid:**
- Tertiary amines (R₃N) do not form N-nitroso amines. Instead, they undergo electrophilic substitution reactions and do not yield the product we are interested in.

5. **Conclusion:**
- Therefore, the amine that yields N-nitroso amine after treatment with nitrous acid is a **secondary amine**.

### Final Answer:
The amine that yields N-nitroso amine after treatment with nitrous acid `(NaNO₂, HCl)` is a **secondary amine**.

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