Reaction of terminal alkyne with ammoniacal silver nitrate or copper 1 nitrate

Alkynes with a triple bond at the end of the chain react with ammoniacal silver nitrate or ammoniacal copper I chloride to form white precipitate or red precipitate respectively.

Example

This reaction is used to distinguish alkynes with a triple bond at the end from those with a triple bond in the middle of the chain.

For example CH₃CH₂C ≡ CH     forms a white precipitate with ammoniacal silver nitrate while CH₃C ≡ C CH₃   does not.

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