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NEET levelSingle correct optionDifficulty 1 of 3si022

Which hydrocarbon gives a white precipitate with ammoniacal silver nitrate?

A $CH X_{3} CH = CH X_{2}$
B $CH X_{2} = CH X_{2}$
CBut-2-yne
DPropyne, $CH X_{3} C \equiv CH$

Answer: D

Only terminal alkynes have an acidic

\equiv C - H

and form insoluble silver acetylides. Propyne is terminal; but-2-yne is an internal alkyne, and alkenes have no acidic hydrogen.

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