Suggest a route for the preparation

Question:

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

Solution:

(i) By intermolecular condensation method, we can cycle acetylene and then treated at high temperature in a red hot iron tube.

(ii) The aliphatic compound thus converted into benzene is treated with con.HNO3 and Conc.H2SO4 which undergoes nitration to give nitrobenzene.

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