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NEET levelSingle correct optionDifficulty 1 of 3hc077

Which of the following gives a white precipitate with ammoniacal silver nitrate?

Abut-2-yne, $CH X_{3} - C \equiv C - CH X_{3}$
Bpropane, $CH X_{3} - CH X_{2} - CH X_{3}$
Cpropene, $CH X_{3} - CH = CH X_{2}$
Dpropyne, $CH X_{3} - C \equiv CH$

Answer: D

Only a compound with a terminal

C \equiv C - H

has an acidic hydrogen that can be replaced by

Ag X^{+}

to give a silver alkynide precipitate. Propyne has such a hydrogen; but-2-yne, propene and propane do not.

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