Acetylene and hydrogen cyanide is passed through a red-hot tube 2:1 to form?

Answer:

Acetylene and hydrogen cyanide is passed through a red hot tube 2:1 to form benzene.

Reaction

Acetylene on passing through a red-hot iron tube at 873K undergoes cyclic polymerization. Three molecules of acetylene undergo polymerization to produce benzene (C6H6).

 

\((C_{2}H_{6})_{3}\overset{Red\, hot\, tube}{\rightarrow}C_{6}H_{6}\)

 

This is the famous Diels Alder reaction.

The Diels-Alder reaction is a conjugate addition reaction of a conjugated diene to an alkene or alkyne (the dienophile) to produce cyclohexane.

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