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NEET levelSingle correct optionDifficulty 1 of 3hc111

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

A $CH X_{3} - CH X_{2} - CH X_{2} - CH X_{3}$ (butane)
B $CH X_{3} - CH X_{2} - C \equiv CH$ (but-1-yne)
C $CH X_{3} - CH X_{2} - CH = CH X_{2}$ (but-1-ene)
D $CH X_{3} - C \equiv C - CH X_{3}$ (but-2-yne)

Answer: B

Only a terminal alkyne has an acidic

sp

C-H bond that can be replaced by

Ag X^{+}

. But-1-yne forms silver butynide, a white precipitate; but-2-yne, but-1-ene and butane have no such hydrogen.

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