$\begin{array}{1 1} \text{by heating phenol with HF and KF} \\ \text{From online by diazotisation followed by heating the diazonium salt with }HBF_4 \\ \text{By direct fluorination of benzene with} F_2 gas \\ \text{By reacting bromobenzene with }NaF \;solution \end{array} $
