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Electrophilic Substitution Reactions of Haloarenes

Cu+ ion is no...

Question

$C u^{+}$ ion is not stable in aqueous solution because:

second ionisation enthalpy of copper is less than the first ionisation enthalpy

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large value of second ionisation enthalpy of copper is compensated by much more negative hydration energy of

C u_{(a q)}^{2 +}

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hydration energy of

C u_{(a q)}^{2 +}

is much more negative than that of

C u_{(a q)}^{2 +}

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many copper (I) compounds are unstable in aqueous solution and undergo a disproportionation reaction

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Solution

The correct option is B large value of second ionisation enthalpy of copper is compensated by much more negative hydration energy of $C u_{(a q)}^{2 +}$
$C u$ ion is not stable in aqueous solution because large value of second ionisation enthalphy of copper is compenscited by much more negative hydration energy of ${C u}_{(a q .)}^{2 +}$

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