Correct Answer: Option D

Explanation

When ethyne, also known as acetylene (C₂H₂), is passed through a red-hot iron tube at 873 K, the product formed is benzene. This process is called cyclic polymerization. Benzene is an aromatic compound since aromatic compounds are substances that consist of one or more rings that contain alternating single and double bonds in its chemical structure. 

The chemical equation for this reaction is: 3C\(_2\)H\(_2\) (g) → C\(_6\)H\(_6\) (g), where three molecules of ethyne combine to produce one molecule of benzene. 

There is an explanation video available below.

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