`Cu_((aq.))^+` has less stable nature than `Cu_((aq.))^(2+)` but `Fe_((aq.))^(3+)` is more stable than `Fe_((aq.))^(2+)`.
Half-filled and completely filled, sub-shell are more stable.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false
D. If assertion is false but reason is true.

Answer

B

Explanation

(b) In `Cu^(+)`, no double outer shell has `3 d^10` or completely filled configuration but hydration enegry of `Cu^(+) (aq.)` is more.