(D) The electronic configuration of $Cu^{+}$ is $[Ar] 3d^{10}$. Since all $d-$orbitals are completely filled,there are no unpaired electrons,making it

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Cuprous ion has complete $d-$ orbital and cupric ion has an incomplete $d-$ orbital.

(D) The electronic configuration of $Cu^{+}$ is $[Ar] 3d^{10}$. Since all $d-$orbitals are completely filled,there are no unpaired electrons,making it colourless.The electronic configuration of $Cu^{2+}$ is $[Ar] 3d^9$. It contains one unpaired electron in the $d-$orbital,which allows for $d-d$ transitions,making it coloured.

Class 12 Chemistry d-and f-Block Elements General Characteristics

Easy

Cuprous ion is colourless while cupric ion is coloured because

AIIMS 2012 All AIIMS

A
Both have half filled $p-$ and $d-$ orbitals
B
Cuprous ion has incomplete $d-$ orbital and cupric ion has a complete $d-$ orbital
C
Both have unpaired electrons in the $d-$ orbitals
D
Cuprous ion has complete $d-$ orbital and cupric ion has an incomplete $d-$ orbital.