A) bromine in \[CC{{l}_{4}}\]
B) ammonical \[C{{u}_{2}}C{{l}_{2}}\]
C) bromine water
D) alkaline \[KMn{{O}_{4}}\]
Correct Answer: B
Solution :
Ethyne reacts with ammonical cuprous chloride solution to produce red colour \[\underset{\text{Ethyne}}{\overset{CH}{\mathop{|||}}}\,+2Cu(N{{H}_{3}}){{2}^{+}}\xrightarrow{{}}\underset{\begin{smallmatrix} \text{Cuprous}\,\text{acetlide}\,\text{(Red}\ \text{ppt}\text{.)} \\ \,\,\,\,\,\,\,\,\, \end{smallmatrix}}{\mathop{\underset{C.Cu}{\overset{C.Cu}{\mathop{|||}}}\,}}\,\] \[+\,2NH_{4}^{+}+2N{{H}_{3}}\] Ethene does not react with ammonical \[\text{C}{{\text{u}}_{\text{2}}}\text{C}{{\text{l}}_{\text{2}}}\text{.}\]
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