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

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Identify a reagent from the following list which can easily distinguish between 1- butyne and 2-butyne.
A. bromine, `C Cl_(4)`
B. `H_(2)` Lindlar catalyst
C. dilute `H_(2)SO_(4), HgSO_(4)`
D. ammonical `Cu_(2)Cl_(2)` solution
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`CH_(3)-CH_(2)-C-=CH underset(NH_(4)OH)overset(Cu_(2)Cl_(2))rarr underset("Blood red colour")(CH_(3)-CH_(2)-C-=overset(Θ)Cu^(o+))+NH_(4)Cl+H_(2)O`
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