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

Options

A. bromine , `C Cl_(4)`
B. `H_(2)`Lindlar catalyst
C. dilute `H_(2)SO_(4), Hg SO_(4)`
D. ammonical `Cu_(2)Cl_(2)` solution

Answer

d

Explanation

In 1 - butyne terminal hydrogen is acidic where as in 2 - butyne there is no terminal hydrogen . Thus 2 - butyne will not react with ammonical `Cu_(2)Cl_(2)` . While 1 - butyne , being terminal alkyne , will give red ppt. with ammonical cuprous chloride .