Question

Which of the following converts benzene diazonium chloride to benzene?

• A. $H_3{PO}_2$
• B. $CuCN$
• C. $H_{2}O$
• D. ${HBF}_4$

Answer 1

The correct option is A $H_3{PO}_2$

Benzenediazonium chloride can be converted to benzene by using ethanol or phosphinic acid.

In this reaction, benzene diazonium ion is reduced. The diazonium group is replaced by $-H$.

$C_6{H}_5-N_2^{+}{X}^{-}+H_{3}P{O}_2+H_{2}O\to C_6{H}_6+N_2\uparrow +H_{3}P{O}_3+HX$

Option A is correct.