Name the hydrocarbon which :

(d) forms a red precipitate with ammoniacal solution of copper (I) chloride,

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Solution

The hydrocarbon which forms a red precipitate with ammoniacal solution of copper chloride is acetylene.

HC $\equiv$ CH

Acetylene

Terminal alkynes (including acetylene) form a red precipitate of copper acetylides when it is passed through ammoniacal cuprous chloride solution.

R−C $\equiv$ C−H+CuCl+NH3 $\to$
R−C $\equiv$ C−Cu+NH4Cl

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