A) dil. alkaline \[KMn{{O}_{4}}\]
B) \[{{I}_{2}}\]and\[NaOH\]
C) ammoniacal \[C{{u}_{2}}C{{l}_{2}}\]
D) anhydrous\[ZnC{{l}_{2}}+\]cone.\[{{H}_{2}}S{{O}_{4}}\]
Correct Answer: C
Solution :
Ethyne gives red precipitate of\[CuC\equiv CCu\]on reaction with ammoniacal\[C{{u}_{2}}C{{l}_{2}}\]but ethane does not react with ammoniacal\[C{{u}_{2}}C{{l}_{2}}\]. \[CH\equiv CH+C{{u}_{2}}C{{l}_{2}}\] (ammoniacal) \[\xrightarrow[{}]{{}}\] \[\underset{red\text{ }ppt}{\mathop{CuC\equiv CCu+2HCl}}\,\]
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