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