A) from aniline by diazotization followed by heating the diazonium salt with\[HB{{F}_{4}}\]
B) by direct fluorination of benzene with \[{{F}_{2}}\] gas
C) by reacting bromobenzene with \[NaF\] solution
D) by heating phenol with \[HF\] and \[KF\]
Correct Answer: A
Solution :
When diazonium salt is treated with fluoroboric acid\[(HB{{F}_{4}})\], the fluorobenzene is obtained. This reaction is called Schiemann reaction.
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