Which among the following is true for Balz-Schiemann reaction?

1. In this $\mathrm{Ar}-\mathrm{Cl}$ is obtained from $\mathrm{Ar}-\mathrm{N}_{2}^{+} \mathrm{X}^{-}$
2. It is useful for preparation of nitrobenzene from benzene diazonium salts
3. In this Ar - CN is obtained from $\mathrm{Ar}-\mathrm{N}_{2}^{+} \mathrm{X}^{-}$
4. In this $\mathrm{Ar}-\mathrm{F}$ is obtained from $\mathrm{Ar}-\mathrm{N}_{2}^{+} \mathrm{X}^{-}$

Solution

Balz-Schiemann Reaction: When arene-diazonium chloride is prepared with fluoroboric acid, arene diazonium fluoroborate is precipitated and decomposes to yield aryl fluoride which on heating.

Asked in: MHT CET 2020 (14 Oct Shift 1)

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