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

$\begin{array}{1 1}(a)\;\text{Bromine},CCl_4\\(b)\;H_2, \text{Lindlar catalyst}\\(c)\;\text{Dilute }H_2SO_4\\(d)\;\text{Ammonical }Cu_2Cl_2\text{ solution}\end{array}$

1 Answer

There will be no reaction between butene-2 and $Cu_2Cl_2$ because it has no acidic hydrogen.In butyne-1 the terminal hydrogen is acidic $(CH_3CH_2-C\equiv CH)$ so it will give a real ppt with ammonical $Cu_2Cl_2$
Hence (d) is the correct option.
answered Mar 18, 2014 by sreemathi.v 1 flag

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