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

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Solution

Acetylene to benzene:

Acetylene $(C_{2} H_{4})$ when passed through a red-hot iron tube at $873 K$ , undergoes cyclic polymerization to give benzene.

Benzene to nitrobenzene:

Benzene when heated with nitrating solution

i.e. 𝑐𝑜𝑛𝑐. $H N O_{3}$ and 𝑐𝑜𝑛𝑐. $H_{2} S O_{4}$ , undergoes nitration to give nitrobenzene as the product

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