Identify a reagent from the following list which can easily distinguish between 1-butyne and 2-butyne.

1- butyne is a terminal alkyne.Terminal alkyne gives glacer coupling on reacting with ammonical copper CH3C CCH3 C C H CH3 H3C H (Cis) Lindlar’s Catalyst HYDROCARBONS 18 chloride solution. This formation of copper butylide gives red precipitates. 2 2 4 4 2 R-C C-H+Cu Cl +2NH OH R-C C-Cu +2NH Cl+2H O -> Aromatic Hydrocarbons