Electronic configuration of is whereas that of is . Which of the following is correct?

Question

Electronic configuration of  is  whereas that of  is . Which of the following is correct?

Canvas Classes · Accepted Answer

Concept: Stability of Cu(I) vs Cu(II) in aqueous solution

Although  has the stable  configuration,  is more stable in aqueous solution due to its much higher hydration enthalpy.

Disproportionation of Cu⁺:

This reaction is spontaneous, confirming Cu⁺ is unstable in water.

Reason: The higher charge density of  leads to a much larger hydration enthalpy compared to . This extra stabilisation energy more than compensates for the higher 2nd ionisation energy.

Answer: Option (2) — Cu(II) is mor

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