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

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

NTA AbhyasNTA Abhyas 2022

Solution:

Ammoniacal $Cu_{2}Cl_{2}$ reacts with terminal alkynes to give red precipitate while other alkynes do not react with it.
$\text{R} - \text{C} \equiv \text{CH} \rightarrow _{\text{Cu}_{\text{2}} \text{Cl}_{\text{2}}}^{\text{ammonical}} \underset{\text{red ppt} \text{.}}{\text{R} - \text{C} \equiv \overset{-}{\text{C}} \overset{+}{\text{Cu}}}$