Name a hydrocarbon which will form a red 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, no reaction occurs and no precipitate is obtained. Hence Ammoniacal solution of Copper (I) Chloride $(CuCl)$ is used to distinguish between Ethyne $(C_{2} H_{2})$ and Ethene $(C_{2} H_{4})$ .
So, Ethyne is a hydrocarbon that will form a red precipitate with an Ammoniacal solution of Copper (I) Chloride

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Name the hydrocarbon which :
(a)is a tetrahedral molecule,
(b)is a planar molecule,
(c)is a linear molecule,
(d)forms a red precipitate with ammoniacal solution of copper (I) chloride,
(e) is known as paraffin,
(f) is known as olefin.
(g) a compound which will give acetylene (ethyne) gas when treated with water.

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