Acetylene polymerizes to give:

benzene

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polyethene

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butane

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octane

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Solution

The correct option is D benzene
Acetylene polymerizes to give benzene, in the presence of chromium trioxide-silica-alumina catalyst, and at a temperature of $40^{0}$ C. Another reaction could be Acetylene when passed through red-hot copper tube gives benzene.
$3 C_{2} H_{2} r e d h o t c o p p e r t u b e - ---------- \to C_{6} H_{6}$

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