A) Only ethyne
B) Ethane and ethyne
C) Ethane and ethane
D) Ethane, ethene and propene
Correct Answer: D
Solution :
Key Idea: Terminal alkynes are precipitated in form of acetylides when they react with\[AgN{{O}_{3}}\]. Alkane and alkene do not react with \[AgN{{O}_{3}}\]. (i)\[\underset{ethane}{\mathop{{{C}_{2}}{{H}_{6}}}}\,+AgN{{O}_{3}}\xrightarrow{{}}No\,\,reaction\] (ii)\[\underset{ethene}{\mathop{{{C}_{2}}{{H}_{4}}}}\,+AgN{{O}_{3}}\xrightarrow{{}}No\,\,reaction\] (iii)\[\underset{propene}{\mathop{{{C}_{3}}{{H}_{6}}}}\,+AgN{{O}_{3}}\xrightarrow[{}]{{}}No\,\,reaction\] (iv)\[\underset{ethyne}{\mathop{HC\equiv CH}}\,+AgN{{O}_{3}}\xrightarrow{{}}\]\[\underset{\begin{smallmatrix} white\,\,ppt.\,\,of\,\,silver \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,acetylide \end{smallmatrix}}{\mathop{Ag-C\equiv C-Ag}}\,\] \[\because \]Ethane, ethene and propene do not react with\[AgN{{O}_{3}}\]. \[\therefore \]They come out of wolf bottle.
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