Question

Aryl diazonium reacts with fluoroborate to give aryl fluoride:

• A. Balz-Schiemann reaction
• B. Stephen reaction
• C. Gattermann reaction
• D. Gomberg reaction

Hint:

Remember: Balz-Schiemann reaction is the key method to prepare aryl fluorides from aryl diazonium salts — an important named reaction for GPAT organic chemistry.

Answer 1

The Correct Option is A

- The Balz-Schiemann reaction involves the conversion of an aryl diazonium salt into an aryl fluoride by thermal decomposition of the corresponding aryl diazonium tetrafluoroborate salt.
- General reaction: \[ \text{Ar-N}_2^+ BF_4^- \xrightarrow{\Delta} \text{Ar-F} + N_2 + BF_3 \] where Ar = aryl group.
- This reaction is widely used to introduce fluorine atoms into aromatic rings, which is important in the synthesis of fluorinated aromatic compounds.
- Other options: - Stephen reaction reduces nitriles to aldehydes.
- Gattermann reaction introduces formyl groups into aromatic rings.
- Gomberg reaction is related to the formation of triphenylmethyl radicals.
- Therefore, the correct reaction that produces aryl fluoride from aryldiazonium salts using fluoroborate is the Balz-Schiemann reaction.