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

bromine,

C C l_{4}

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H_{2}

, Lindlar catalyst

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dilute

H_{2} S O_{4}, H g S O_{4}

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ammonical

C u_{2} C l_{2}

solution

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Solution

The correct option is D ammonical $C u_{2} C l_{2}$ solution
In 1- butyne, terminal hydrogen is acidic where as in 2- butyne there is no terminal hydrogen. Thus, 2- butyne will not react with ammonical $C u_{2} C l_{2}$ while 1- butyne, being terminal alkyne, will give red precipitate with ammonical curprous chloride. Hence, the correct answer is option (d).

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