Question

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

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Solution

## Acetylene ( ${\mathrm{C}}_{2}{\mathrm{H}}_{2}$) on passing through a red-hot iron tube at $873\mathrm{K}$ undergoes cyclic polymerization. Three molecules of acetylene undergo polymerization to produce benzene ${\mathrm{C}}_{6}{\mathrm{H}}_{6}$.${\left({\mathrm{C}}_{2}{\mathrm{H}}_{6}\right)}_{3}\left(\mathrm{aq}\right)\stackrel{}{\stackrel{\mathrm{red}\mathrm{hot}\mathrm{tube}}{\to }{\mathrm{C}}_{6}{\mathrm{H}}_{6}\left(\mathrm{aq}\right)}$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 reactionThe 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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