A compound which does not give positive test for nitrogen is:
urea
azobenzene
glycine
phenyl hydrazine.

Options

A. urea
B. azobenzene
C. glycine
D. phenyl hydrazine.

Explanation

To determine which compound does not give a positive test for nitrogen among the options provided (urea, azobenzene, glycine, phenyl hydrazine), we need to analyze each compound for the presence of nitrogen.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- Urea (NH2CONH2)
- Azobenzene (C12H10N2)
- Glycine (NH2CH2COOH)
- Phenyl hydrazine (C6H7N3)

2. **Check for Nitrogen Presence:**
- **Urea:** Contains two amine (NH2) groups, hence it has nitrogen.
- **Azobenzene:** Contains two nitrogen atoms in its structure, hence it has nitrogen.
- **Glycine:** Contains one amine group (NH2), hence it has nitrogen.
- **Phenyl hydrazine:** Contains one nitrogen atom in the hydrazine group (N2H5), hence it has nitrogen.

3. **Conclusion:**
- All the compounds listed have nitrogen in their structure except for **azobenzene**, which has nitrogen but is not a typical amine or amide and does not give a positive test for nitrogen in the same way as the others.

### Final Answer:
The compound that does not give a positive test for nitrogen is **azobenzene**.