Question

How Do You Identify Alkynes?

Answer 1

To identify alkynes

• Alkynes are unsaturated hydrocarbon which carry triple bond between carbon atom. the formula is ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{\mathrm{n}}$.
• Reaction of alkynes with ammonical cuprous chloride. $\mathrm{Alkynes}+\mathrm{Ammonical}\mathrm{cuprous}\mathrm{chloride}\to \mathrm{red}\mathrm{percipitate}\mathrm{of}\mathrm{cuprous}\mathrm{acetylide}$ For example: $\mathrm{CH}\equiv \mathrm{CH}+2\mathrm{CuCl}+2{\mathrm{NH}}_3\to \mathrm{CuC}\equiv \mathrm{CCu}+4{\mathrm{NH}}_4\mathrm{Cl}$

Thus, alkynes can be identified by reaction with ammonical cuprous chloride.