Fluorobenzene $\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{~F}\right)$ can be synthesized in the laboratory

Fluorobenzene $\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{~F}\right)$ can be synthesized in the laboratory
  1. by heating phenol with $\mathrm{HF}$ and $\mathrm{KF}$
  2. from aniline by diazotisation followed by heating the diazonium salt with $\mathrm{HBF}_4$
  3. by direct fluorination of benzene with $\mathrm{F}_2$ gas
  4. by reacting bromobenzene with NaF solution

Solution

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Asked in: JEE Main 2006

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