JEE Main 2026 Apr 6 Shift 1, Chemistry Q11: Colour, Magnetism And Stability Of Co-ordination Compounds

JEE Main2026Apr 6, Shift 1Chemistry

Match the List-I with List-II:

List-I (Electronic configuration of tetrahedral metal ion)		List-II (CFSE in units of $Δ_{t}$ )
A.	$d^{2}$	I.	$- 0.6$
B.	$d^{4}$	II.	$- 0.8$
C.	$d^{6}$	III.	$- 1.2$
D.	$d^{8}$	IV.	$- 0.4$

Choose the correct answer from the options given below:

A
A-III, B-IV, C-II, D-I
B
A-III, B-I, C-IV, D-II
C
A-III, B-IV, C-I, D-II
D
A-II, B-I, C-IV, D-III

Solution

For tetrahedral splitting, electrons fill $e$ (lower, two orbitals) first then $t_{2}$ (upper, three orbitals). With $n_{1} =$ electrons in $e$ and $n_{2} =$ electrons in $t_{2}$ :

$CFSE = (- \frac{3}{5} n_{1} + \frac{2}{5} n_{2}) Δ_{t}$ .

$d^{2}$ (e $^{2}$ , t $_{2}^{0}$ ): $- \frac{6}{5} Δ_{t} = - 1.2 Δ_{t}$ $\to$ III.

$d^{4}$ (e $^{2}$ , t $_{2}^{2}$ ): $(- \frac{6}{5} + \frac{4}{5}) Δ_{t} = - 0.4 Δ_{t}$ $\to$ IV.

$d^{6}$ (e $^{3}$ , t $_{2}^{3}$ ): $(- \frac{9}{5} + \frac{6}{5}) Δ_{t} = - 0.6 Δ_{t}$ $\to$ I.

$d^{8}$ (e $^{4}$ , t $_{2}^{4}$ ): $(- \frac{12}{5} + \frac{8}{5}) Δ_{t} = - 0.8 Δ_{t}$ $\to$ II.

$∴$ A-III, B-IV, C-I, D-II.

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JEE Main 2026 Apr 6 Shift 1, Chemistry Q11: Colour, Magnetism And Stability Of Co-ordination Compounds

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