b (b)N-alkyl formamides when dehydrated with $POCl_3$ in presence of pyridine give isocyanides.
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Fluorination of an aromatic ring is easily accomplished by treating a diazonium salt with $HBF_4$. Which of the following conditions is correct about this reaction?
The end product of the reaction ${\text{ethyl amine}}\xrightarrow{{{\text{HN}}{{\text{O}}_{\text{2}}}}}A\xrightarrow{{PC{l_5}}}B\xrightarrow{{KCN}}C$ is