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JEE Main Chemistry question

ChemistryHaloalkanes and HaloarenesJEE Main

The dihalogen derivative of a hydrocarbon with three carbon atoms reacts with alcoholic KOH and produces another hydrocarbon which forms a red precipitate with ammoniacal CuCl. gives an aldehyde on reaction with aqueous KOH. The compound is

Answer: (D)

Solution

A red precipitate with ammoniacal CuCl requires formation of a *terminal* alkyne, so alcoholic KOH (double dehydrohalogenation) on must give propyne (CHCCH); this requires both halogens on the *same terminal* carbon,

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Question ID VK-142190