Suggest a route for the preparation of nitrobenzene starting from acetylene ?

Explanation

Acetylene when passed through red hot iron tube at 873 K, undergoes cyclic polymerisation benzene which upon subsequent nitration gives nitrobenzene.

Note in nitration of benzene ring conc `H_(2)SO_(4)` acts as an catalyst to produce an electrophile `+NO_(2)` (from `HNO_(3)`)