Identify the reagent which can easily distinguish between but-1-yne and but-2-yne:

bromine in

C C l_{4}

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H_{2}

, Lindlar's catalyst

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dilute

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

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ammoniacal

C u_{2} C l_{2}

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Solution

The correct option is D ammoniacal $C u_{2} C l_{2}$
But-1-yne contains acidic hydrogen and hence it reacts with ammonical $C u_{2} C l_{2}$ to form a red precipitate of $c o p p e r - 1 - b u t y n i d e$ whereas but-2-yne does not react with ammonical $C u_{2} C l_{2}$ as it do not have acidic hydrogen.

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