Correct Answer: Option D

Explanation

A hydrocarbon that will produce a red precipitate when reacted with an aqueous solution of copper(I) chloride is an alkyne. More specifically, an alkyne with a terminal triple bond, like ethyne (acetylene), will react to form a red precipitate of copper(I) acetylide. The most reactive alkynes are those where the triple bond is at the end of the carbon chain (terminal triple bond).

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