Assertion: The reaction between a diazo salt and an aromatic amine or a phenol, giving an aminoazo or hydroxyazo compounds is called coupling reaction.
Reason: Condensation of diazonium salt with phenol is carried out in weakly acidic medium.

Options

A. If both assertion and reason are true and the reason is the correct explanantion of the assertion.
B. If both assertion and reason are true but reason is not the correct explanantion of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Explanation

To analyze the assertion and reason provided in the question, we will break down the components step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the reaction between a diazo salt and an aromatic amine or phenol results in the formation of aminoazo or hydroxyazo compounds, and this reaction is known as a coupling reaction.
- **Conclusion**: This statement is true. The coupling reaction involves the electrophilic substitution of the diazonium ion onto the aromatic ring of the amine or phenol, leading to the formation of azo compounds.

2. **Understanding the Reason**:
- The reason states that the condensation of diazonium salt with phenol is carried out in a weakly acidic medium.
- **Conclusion**: This statement is false. The reaction of diazonium salts with phenols typically occurs in a neutral to slightly alkaline medium, not in a weakly acidic medium.

3. **Final Evaluation**:
- Since the assertion is true and the reason is false, we conclude that the assertion is correct, but the reason provided does not support the assertion.

### Final Conclusion:
- The assertion is true, while the reason is false.