Question

By reduction of nitrosobenzene which of the following is not obtained
A.
 
B.

C.

D.

Answer 1

Hint: In Reduction of nitrosobenzene, a hydrogen molecule is added to nitrosobenzene or can say gain of electrons by nitrosobenzene. Also, releasing oxygen atom from nitrobenzene to reduce the oxidation state (reduction) of nitrosobenzene take place.

Complete Step by Step Solution:
Nitrosobenzene can be separated from nitrobenzene by adding two protons (2H+) and 2 electrons such as


Then, nitrosobenzene is made to gain two electrons firstly to form phenyl hydroxylamine to which again two electrons are added to form Aniline with water as side product such as


Now nitrosobenzene and phenyl hydroxylamine both are condensed with each other to give azoxybenzene in which nitrogen carries a positive charge because of one more bond than its valence. Then, Azoxybenzene undergoes reduction by adding two electrons to give azobenzene with water in addition product such as


We get aniline, azobenzene and phenyl hydroxylamine after reduction of nitrosobenzene, but we can not get nitrobenzene from nitrosobenzene because in reduction gain of electrons take plane but not the addition of oxygen molecule.
Thus, the correct option is D.

Note: Nitrosobenzene is itself prepared by reduction of nitrobenzene thus after reduction on nitrosobenzene we can not again get nitrobenzene. It can be prepared by the aniline, but that is also not direct conversion. Nitrobenzene is prepared by nitration of benzene.