Question

Which of the following statement is true for the Benzenediazonium fluoroborate?

• A. When it heated with \( \mathrm{NaNO_2} \) in presence of Cu, it gives aniline.
• B. On heating, it does not decompose to yield fluorobenzene.
• C. It is water insoluble and stable at room temperature.
• D. It is water soluble and unstable at room temperature.

Hint:

Remember benzenediazonium fluoroborate through the Balz-Schiemann reaction: it is stable, can be isolated, and on heating it gives fluorobenzene.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Most diazonium salts (like benzene diazonium chloride) are unstable and water-soluble, but fluoroborates are special exceptions.
Step 2: Formula Application:
Structure: $[C_6H_5N_2]^+[BF_4]^-$.
Step 3: Explanation:
Unlike the chloride salt, benzenediazonium fluoroborate is relatively stable and can be stored at room temperature. It is also insoluble in water. When heated, it undergoes the Schiemann reaction to produce fluorobenzene.
Step 4: Final Answer:
Statement (c) is true.