First slide

Valence bond theory

Question

Which of the following complex ions is not diamagnetic ?

Moderate

A

${[Ti (en)_{2} {({NH}_{3})}_{2}]}^{4 +}$
B

${[Cr {({NH}_{3})}_{6}]}^{3 +}$
C

${[Zn {({NH}_{3})}_{6}]}^{2 +}$
D

${[Sc {(H_{2} O)}_{3} {({NH}_{3})}_{3}]}^{3 +}$

Solution

$\begin{array}{l} {[Cr {({NH}_{3})}_{6}]}^{+ 3} \\ Cr (Z = 24) . ..... [Ar] 4 s^{1} 3 d^{5} \\ {Cr}^{+ 3} . . ..... [Ar] 3 d^{3} \end{array}$
Irrespective of the field strength of ligands in octahedral ${Cr}^{+ 3}$ complexes rearrangement does not occur.
Hybridization is $d^{2} {sp}^{3}$ . $μ_{s} = \sqrt{3 (3 + 2)} B . M .$
$\begin{array}{l} (1) . ..... {Ti}^{+ 4} . .... [Ar] \\ (3) . .... {Zn}^{+ 2} . .... [Ar] 3 d^{10} \\ (4) . .... {Sc}^{+ 3} . ... [Ar] \end{array}$
All these species do not have unpaired electrons.

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