Given the diazonium salt shown, which product is formed on treatment with $NaNO_2$, Cu and heat? 
AFluorobenzene
BNitrobenzene
C$m$-Nitrofluorobenzene
D$p$-Nitrofluorobenzene
Answer & Solution
Correct answer: B. Nitrobenzene
The substrate is benzenediazonium tetrafluoroborate. On treatment with nitrite in presence of copper and heat, the diazonium group is replaced by $NO_2$, giving nitrobenzene. Fluorobenzene would arise from the Schiemann reaction on heating the diazonium tetrafluoroborate directly, but that is not the reaction asked here.
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