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

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Identify the 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) ammonical Cu2Cl2 solution

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Correct answer: (d) ammonical Cu2Cl2 solution

Explanation:

Ammoniacal cuprous chloride gives precipitate (red) only with terminal alkynes, i.e. alkynes having acidic hydrogen atom, such as butyne-1 (CH ≡ CCH2CH3)

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