Ethyne gives ___ precipitate with ammoniacal solution of copper (I) chloride.

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Solution

When Ammoniacal solution of Copper (I) Chloride is added to Ethyne then it gives red precipitates.
But when an Ammoniacal solution of Copper (I) Chloride is added to Ethene then no reaction occurs and no precipitate is obtained.
Hence, an Ammoniacal solution of Copper (I) Chloride $(CuCl)$ can be used to predict between Ethyne $(C_{2} H_{2})$ and Ethene $(C_{2} H_{4})$
Final answer:
Ethyne gives red precipitate with ammoniacal solution of Copper (I) chloride.

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