Question

+
N = NBF4

Δ
→ A
In the above process product, A is
(a) Fluorobenzene
(b) Benzene
(c) 1, 4-difluorobenzene
(d) 1, 3-difluorobenzene

Answer 1

Answer:

option (a). --- fluorobezene

Answer 2

The correct answer will be option a , Fluorobenzene .

• Firstly, Benzene diazonium  chloride is treated with hydro fluoroboric acid (HBF4) to form Benzene Diazonium fluoroborate.
• This is then heated to form fluorobenzene giving dinitrogen and boron trifluoride as by-products.

• This reaction of producing fluorobenzene from benzene diazonium  salt is called Schiemann-Balz  reaction.

• Instead of HBF4, NaBF4 can also be used to produce Benzene Diazonium fluoroborate