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Fluorination of an aromatic ring is easily accomplished by treating a diazonium salt with HBF4. Which of the following conditions is correct about this reaction ?

$\begin{array}{1 1}(1)\; Only\; heat \\ (2)\; NaNO_2\;/\;Cu \\ (3)\; Cu_2O\;/\;H_2O \\ (4)\; NaF\;/\;Cu \end{array} $

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