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Question

Which one of the following does not give precipitate with ammoniacal cuprous chloride?

A
H3CCH2CCH
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B
H3CCCH
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C
HCCH
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D
H2CCCCH3
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Solution

The correct option is D H2CCCCH3
Terminal alkynes contain acidic hydrogen. These terminal alkynes react with ammoniacal solutions of cuprous chloride to give red precipitate of copper alkynide.
2-butyne is a non-terminal alkyne whereas other compound are terminal alkynes.
Therefore, 2-butyne H3CCCCH3 does not give precipitate with ammoniacal cuprous chloride. This reactions is given only by terminal alkynes which has acidic hydrogen atom.

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