Question

When reduction of nitrobenzene is carride out in alkaline medium it forms different products depending upon the nature of the reducing agent Azoxybenzene is obtained when nitrobenzene is reduced with
A. `LiAIH_(4)` in ether
B. `Na_(3)AsO_(3)//NaOH`
C. `Zn//NaOH, CH_(3)OH`
D. Zn/NaOH

Answer 1

Correct Answer - B
Azoxybenzene is prepared by reducing nitrobenzene with various reducing agents such as methanolic sodium hydroxide, alkaline soodium arsenite or an alkaline solution of glucose Azoxybenzene (yellow crystalline solid) exists in two geometrical isomeric forms The trans- isomer is ordinary azoxybenzene Azobenzene is prepared by reducing nitrobenzene with iron filings sodium amalgam alkaline sodium stannite or best with zinc dust and methanolic sodium hydroxide LIthium aluminium hydride also reduces nitrobenzene to azobenzene Azobenzene aluminium hydride also reduces nitrobenzene to azobenzene Azobenzene (orange red plates) exists as geometrical isomers the trans - form being ordinary azobenzene Hydrazobenzene (symmetrical-diphenylhydrazine) is prepared by reducing nitrobenzene or azobenzene with zinc dust and aqueous sodium hydroxide
`2PhNO_(2)overset(Zn//NaOH)rarr PhNHNHPh`
.