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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, CCl4

(b)  H2, Lindlar catalyst

(c)  dilute H2SO4, HgSO4

(d)  ammoniacal Cu2Cl2 solution

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Correct option  (d) ammoniacal Cu2Cl2 solution

Explanation:

In 1-butyne, acidic hydrogen is present while in 2-butyne acidic hydrogen is not present, so butyne-1 gives red ppt with ammoniacal  solution, while butyne-2 does not give these ppt.

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