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Q. Among the given compounds, one which can be distinguished by $ AgNO_3$ is

AFMCAFMC 2010Hydrocarbons

Solution:

Only acetylene reacts with $ AgNO_{3} $ and gives white precipitate of silver acetylide among the given compounds.
$ CH\equiv CH\xrightarrow[+NH_{4}OH]{AgNO_{3}}\underset{\text{white ppt}}{CAg\equiv CAg} $
Thus, it is distinguished by $ AgNO_{3}. $