Fluorobenzene can be prepared from aniline by diazotisation followed by

Atreatment with $Cu$ powder and $HF$ (Gattermann reaction)
Btreatment with $HBF X_{4}$ and then heating the isolated $C X_{6} H X_{5} N X_{2} X^{+} BF X_{4} X^{-}$
Cheating with $CuF$ and $HF$ (Sandmeyer reaction)
Dtreatment with aqueous $KF$ at 273 K

Answer: B

Fluorine is introduced by the Balz-Schiemann reaction: benzenediazonium chloride is converted into the insoluble diazonium tetrafluoroborate, which on gentle heating loses

N X_{2}

and

BF X_{3}

to give

C X_{6} H X_{5} F

. Aqueous fluoride does not displace

N X_{2}

cleanly, and Sandmeyer/Gattermann conditions are used for

Cl

and

Br

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Fluorobenzene can be prepared from aniline by diazotisation followed by

Answer: B

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