In which of the tollowing ions, d-d transition is not possible ?

In which of the tollowing ions, d-d transition is not possible ?
  1. $\mathrm{Ti}^{4+}$
  2. $\mathrm{Cr}^{3+}$
  3. $\mathrm{Mn}^{2+}$
  4. $\mathrm{Cu}^{2+}$

Solution

Due to absence of d-electron in $\mathrm{Ti}^{4+}\left([\mathrm{Ar}]^{18} 3 \mathrm{~d}^{0} 4 \mathrm{~s}^{0}ight), \mathrm{d}-\mathrm{d}$ transition is not possible. ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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