Match List I with List II. [2023] List I List II Complex CFSE ( o ) A. [ Cu ( NH 3 ) 6 ] 2 + I. - 0.6 B. [ Ti ( H 2 O ) 6 ] 3 + II. - 2.0 C. [ Fe ( CN ) 6 ] 3 - III. - 1.2 D. [ NiF 6 ] 4 - IV. - 0.4

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Solution

Q.
Match List I with List II. [2023]

List I List II

Complex CFSE $(Δ_{o})$

A. ${[Cu {({NH}_{3})}_{6}]}^{2 +}$ I. - 0.6

B. ${[Ti {(H_{2} O)}_{6}]}^{3 +}$ II. - 2.0

C. ${[Fe {(CN)}_{6}]}^{3 -}$ III. - 1.2

D. ${[{NiF}_{6}]}^{4 -}$ IV. - 0.4

Choose the correct answer from the options given below:

1 A–II, B–III, C–I, D–IV

2 A–I, B–IV, C–II, D–III

3 A–I, B–II, C–IV, D–III

4 A–III, B–IV, C–I, D–II

Ans.
(2)

For octahedral complex: $CFSE = [- 0.4 (n) t_{2 g} + 0.6 (n') e_{g}] Δ_{0} + * n p .$

Complex Ion Configuration Ligand SFL/WFL $t_{2 g}, e_{g}$ configuration CFSE value

(B) ${[Ti {(H_{2} O)}_{6}]}^{3 +}$ ${Ti}^{3 +}$ $d^{1}$ $H_{2} O$ $WFL$ $t_{2 g}^{1, 0, 0} e_{g}^{0, 0}$ $- 0.4 Δ_{o}$ (IV)

(A) ${[Cu {({NH}_{3})}_{6}]}^{2 +}$ ${Cu}^{2 +}$ $d^{9}$ ${NH}_{3}$ $SFL$ $t_{2 g}^{2, 2, 2} e_{g}^{2, 1}$ $- 0.6 Δ_{o}$ (I)

(C) ${[Fe {(CN)}_{6}]}^{3 -}$ ${Fe}^{3 +}$ $d^{5}$ $CN$ $SFL$ $t_{2 g}^{2, 2, 1} e_{g}^{0, 0}$ $- 2.0 Δ_{o}$ (II)

(D) ${[{NiF}_{6}]}^{4 -}$ ${Ni}^{2 +}$ $d^{8}$ $F$ $WFL$ $t_{2 g}^{2, 2, 2} e_{g}^{1, 1}$ $- 1.2 Δ_{o}$ (III)

$where, p = pairing energy$

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