JEE Main Chemistry question

[AIEEE 2006] Fluorobenzene (C₆H₅F) can be synthesised in the laboratory by

(A)Heating phenol with HF and KF
(B)Diazotising aniline and heating the diazonium tetrafluoroborate salt (the Balz–Schiemann reaction)Correct
(C)Direct fluorination of benzene with F₂ gas
(D)Reacting bromobenzene with NaF solution

Answer: (B)

Solution

Direct fluorination of arenes with F₂ is far too violent/uncontrolled to be synthetically useful, and aryl halides do not undergo simple halide-exchange Sɴ2. The standard laboratory

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Question ID VK-140281