Question

Benzene diazonium chloride on treatment with hypophosphorous acid and water yields benzene. Which of the following is used as a catalyst in this reaction?

• A. \( \text{LiAlH}_4 \)
• B. Red P
• C. \( \text{Zn} \)
• D. \( \text{Cu} \)

Hint:

Red phosphorus is a common catalyst used for reducing diazonium salts in aromatic compounds.

Answer 1

The Correct Option is B

Step 1: Understanding the reaction.
In the reduction of benzene diazonium chloride with hypophosphorous acid and water, red phosphorus (\( \text{Red P} \)) is commonly used as the catalyst. This reduces the diazonium ion to produce benzene.

Step 2: Conclusion.
The catalyst used in this reaction is red phosphorus, corresponding to option (2).