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Question

Ethyne on passing through red hot iron at 873 K forms :

A
Ethane
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B
Ethene
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C
Benzene
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D
Toluene
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Solution

The correct option is C Benzene
Cyclic Polymerisation:
The process in which the repeating units are joined together end to end in a cyclic chain.This is the best route for
entering aromatic compounds from aliphatic compounds.
Ethyne on passing through a red hot iron tube at 873 K undergoes cyclic polymerisation to produce one molecule of benzene.

Three molecules of ethyne polymerise to give benzene.

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