Which of the following compound gives yellow oily liquid nitrosamine when react with nitrous aicd

Options

A.
B.
C.
D.

Answer

To solve the question "Which of the following compound gives yellow oily liquid nitrosamine when react with nitrous acid?", we will analyze each option to determine which compound is a secondary amine, as only secondary amines react with nitrous acid to form nitrosamines.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- Nitrous acid (HNO2) reacts differently with primary, secondary, and tertiary amines.
- Primary amines yield nitrogen gas (N2) and alcohol.
- Secondary amines yield nitrosamines, which are yellow oily liquids, and water.
- Tertiary amines yield colorless ammonium cations.

2. **Analyzing the Options**:
- We will check each compound provided in the options to identify whether they are primary, secondary, or tertiary amines.

3. **Option A**:
- The compound is CaH2NH2 (hydrazine).
- This is a primary amine because it is attached to a primary carbon.
- Reaction with HNO2 will yield alcohol and nitrogen gas, not nitrosamine.
- **Conclusion**: Not the answer.

4. **Option B**:
- The compound is NH(CH3)C6H5 (aniline derivative).
- This is a secondary amine because it is attached to two carbon groups (one from the benzene ring and one from the methyl group).
- Reaction with HNO2 will yield nitrosamine (yellow oily liquid) and water.
- **Conclusion**: This is the correct answer.

5. **Option C**:
- The compound is N(C6H5)2 (diphenylamine).
- This is a tertiary amine because it is attached to three carbon groups (two from the phenyl rings).
- Reaction with HNO2 will yield a colorless ammonium cation.
- **Conclusion**: Not the answer.

6. **Option D**:
- The compound is CH2NH2 (benzylamine).
- This is a primary amine because it is attached to a primary carbon.
- Reaction with HNO2 will yield alcohol and nitrogen gas, not nitrosamine.
- **Conclusion**: Not the answer.

### Final Answer:
The compound that gives a yellow oily liquid nitrosamine when reacted with nitrous acid is **Option B**.

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