Which of the following reacts with $[A g ({{N H}_{3})}_{2}] O H$ giving a white precipitate?

{C H}_{3} {C H}_{2} = C H {C H}_{3}

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{C H}_{3} {C H}_{2} C H \equiv C {C H}_{3}

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{C H}_{3} {C H}_{2} C \equiv C H

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{C H}_{3} {C H}_{2} {C H}_{2} {C H}_{2} O H

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Solution

The correct option is D ${C H}_{3} {C H}_{2} C \equiv C H$
Ammonical silver reacts with 1-alkyne (having acidic hydrogen) and give white ppt. Alkynes show sp hybridization so it has a lot of s character. Thus, the alkyne has acidic character.

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