JEE Main Chemistry Class 12 Amines Questions Part 1 Questions

ArNH2+NaNO2

1°‌Aromatic‌amine

+2HX

‌ cold ‌

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Ar−N≡N+X−+NaX

Arene‌diazonium‌salt

+2H2O
The diazonium group can be replaced by fluorine by treating the diazonium salt with fluoroboric acid (HBF ‌4 ). The precipitated diazonium fluoroborate is isolated, dried and heated until decomposition occurs to yield the aryl fluoride. This reaction is known as Balz-Schiemann reaction.
Ar−N2+X−

HBF4

──────▶

Ar−N2+BF4−↓

‌ heat ‌

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Ar−F+BF3+N2