A) \[2C{{u}^{+}}\xrightarrow[{}]{{}}C{{u}^{2+}}+Cu\]
B) \[Cu\xrightarrow[{}]{-e}C{{u}^{+}}\]
C) \[C{{l}_{2}}\xrightarrow[{}]{+2e}C{{l}^{-}}\]
D) \[2Mg+{{O}_{2}}\xrightarrow{{}}2MgO\]
Correct Answer: A
Solution :
Those reactions in which same reactant undergo oxidation and reduction simultaneously are called disproportionation reaction: \[\overset{+1}{\mathop{2C{{u}^{+}}}}\,\xrightarrow{{}}\overset{+2}{\mathop{C{{u}^{2+}}}}\,+\overset{0}{\mathop{Cu}}\,\] In this reaction\[C{{u}^{+}}\]is oxidised to\[C{{u}^{2+}}\]and reduced to Cu. Hence, this is a disproportionation reaction.
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