Which of the following does not disproportionate ?

A u^{3 +}

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C u^{+}

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A u^{+}

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C u^{2 +}

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Solution

The correct options are
B $C u^{+}$
C $A u^{+}$
A disproportionation reaction is one in which a species has been both oxidised and reduced (that is, the oxidation state of the related species found in the products has increased in one instance, and decreased in another, in relation to that of the species found in the reactants).
The classic example of disproportionation is the reaction between chlorine gas and dilute sodium hydroxide, although there are many others:
$C l_{2} + 2 N a O H \to H_{2} O + N a C l + N a C l O$ .
The oxidation state of chlorine is 0 in the reactants, but has decreased to -1 in NaCl AND has increased to +1 in sodium chlorate, NaClO.
Here $C u^{+}$ and $A u^{+}$ are unipositive ions so it can either reduce or oxidize both will not occur at a time these two ions do not undergo disproportionation reaction
Hence options B & C are correct.

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