Question

Convert ethyne into nitrobenzene​

Answer 1

Answer:

Cylic polymerisation of acetylene in red hot Fe tube at 873K will give us benzene. Nitration using a nitrating mixture of conc HNO3 and conc H2SO4 will form Nitro benzene.

Answer 2

Answer: There are two steps to this reaction:

1. By allowing acetylene through a red-hot tube, benzene can be made.
2. The above-formed benzene can be treated with a mixture of the con. sulphuric acid and con. nitric acid gives nitrobenzene.

Explanation:

When ethyne gas is pushed through a red hot iron tube, a cyclic aromatic compound is formed.

Benzene is created when acetylene is heated to 873K in a red hot iron tube. Ethyne could be converted directly to benzene in the presence of red hot Cu or Fe. This reaction was synthesized by Berthelot.

                  $3C_2H_2$    → $C_6H_6$

                  Ethyne      Benzene

A nitro group is added to the benzene ring to convert it to nitrobenzene. Nitrobenzene is formed when a mixture of concentric nitric acid and concentric sulphuric acid is heated. Nitration is the name for this reaction.

                 $C_6H_6 +HNO_3$   → $C_6H_5NO_2 + H_2O$

                Benzene              Nitro-benzene