The d -orbital electronic configuration of the complex among [ Co ( en ) 3 ] 3+ , [ CoF 6 ] 3- , [ Mn ( H 2 O ) 6 ] 2+ and [ Zn ( H 2 O ) 6 ] 2+ that has the highest CFSE is

Chemistry · Coordination Compounds

JEE Main 2025 — 2 April, Evening Shift — Question 9

The $d$ -orbital electronic configuration of the complex among $\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+},\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

and $\left[\mathrm{Zn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ that has the highest CFSE is

Option A:
$t_{2 g}^{3} e_{g}^{2}$
Option B:
$t_{2 g}^{6} e_{g}^{4}$
Option C:
$t_{2 g}^{6} e_{g}^{0}$
Correct
Option D:
$t_{2 g}^{4} e_{g}^{2}$

Answer: C

Step-by-step solution

$\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$ has highest CFSE

$\mathrm{Co}^{3+}$ with SFL (en)

$=t_{2 g}^{6} e_{g}^{0}$

CFSE $=(6 \times(-0.4)+0 \times 0.6) \Delta_{0}$

$=-2.4 \Delta_{0}$

Answer key and solution verified before publishing.

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Exam: JEE Main 2025
Paper: 2 April, Evening Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Properties and importance of Coordination Complexes

Answer: C

Step-by-step solution

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