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

H_{3} C - C H_{2} - C \equiv C H

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H_{3} C - C \equiv C H

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H C \equiv C H

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H_{3} C - C \equiv C - C H_{3}

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Solution

The correct option is D $H_{3} C - C \equiv C - C H_{3}$
2-butyne $H_{3} C - C \equiv C - C H_{3}$ does not give precipitate with ammonical cuprous chloride. This reactions is given by terminal alkynes having acidic H atom.

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