Question

Conversion of benzene diazonium chloride to fluorobenzene

Answer 1

this reaction is called as balz schiemann reaction. in this aniline reacts with NaNO2 and HBF4 at 0-5 degree celsius to give an intermediate which on heating gives fluorobenzene

Answer 2

Benzene diazonium chloride can be converted into fluorobenzene by following step of reactions -

(i). React benzene diazonium chloride with Tetrafluoroboric acid  ( HBF₄ ) , benzene diazonium fluoroborate is formed .

(ii). Heat benzene diazonium fluoroborate in the presence of silicon dioxide ( SO$_{2}$ ) . It decomposes and gives fluorobenzene .

• This reaction is known as Balz - Shiemann reaction .