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Question

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


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Solution

Acetylene ( C2H2) on passing through a red-hot iron tube at 873K undergoes cyclic polymerization. Three molecules of acetylene undergo polymerization to produce benzene C6H6.

(C2H6)3(aq)redhottubeC6H6(aq)

This is 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.

Diels Alder reaction

  • The Diels-Alder reaction is an important organic chemical reaction where the reactants include a substituted alkene and a conjugated diene.
  • This substituted alkene is commonly referred to as a dienophile.
  • This reaction gives rise to a substituted derivative of cyclohexene.
  • The Diels Alder reaction is a very good example of pericyclic reactions which proceed via concerted mechanisms.

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


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