Fluorobenzene, C_6H_5F, can be synthesised in the laboratory

JEE Main Chemistry question

Fluorobenzene, , can be synthesised in the laboratory

(A)By heating phenol with HF and KF
(B)From aniline by diazotisation followed by heating the diazonium salt with Correct
(C)By direct fluorination of benzene with gas
(D)By reacting bromobenzene with NaF solution

Answer: (B)

Solution

Direct fluorination of benzene with gas (C) is far too violent/uncontrolled to be a practical laboratory method, phenol does not undergo simple nucleophilic exchange of for with HF/KF (A), and bromobenzene's aryl bond, stabilised by ring resonance, does not undergo simple nucleophilic

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Question ID VK-148094