A) iodine in \[\text{CC}{{\text{l}}_{4}}\]
B) bromine in\[\text{CC}{{\text{l}}_{4}}\]
C) alkaline \[\text{KMn}{{\text{O}}_{\text{4}}}\]
D) ammonical \[\text{C}{{\text{u}}_{\text{2}}}\text{C}{{\text{l}}_{\text{2}}}\]
Correct Answer: D
Solution :
\[{{\text{I}}_{\text{2}}}\text{/CC}{{\text{l}}_{\text{4}}}\text{,B}{{\text{r}}_{\text{2}}}\text{/CC}{{\text{l}}_{\text{4}}}\] and alkaline \[\text{KMn}{{\text{O}}_{4}}\]are used to test for unsaturation, therefore, these tests are only performed by ethene. Ammonical \[\text{C}{{\text{u}}_{\text{2}}}\text{C}{{\text{l}}_{\text{2}}}\]is not used to distinguish ethane from ethane. It is used to distinguish ethene from ethyne.
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