Discussion
Aryl fluorides are prepared from diazonium salts using
Answer: E
Aryl fluorides are prepared using HBF4 (fluoroboric acid).
In the Balz-Schiemann reaction, the diazonium salt is treated with fluoroboric acid to precipitate arenediazonium fluoroborate, which on heating decomposes to the aryl fluoride, nitrogen and BF3.
Simple fluoride salts such as NaF, KF or AlF3 do not give aryl fluorides from diazonium salts in the way CuCl or KI give chlorides and iodides, and BF3 is a by-product, not the reagent.
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