Match List-I with List-II. List-I (Complex) List-II (Hybridisation & Magnetic characters) --- --- (A) [ . MnBr 4 ] 2- (I) d 2 sp 3 \& diamagnetic (B) [ FeF 6 ] 3- (II) sp 3 d 2 & paramagnetic (C) [ Co ( C 2 O 4 ) 3 ] 3- (III) sp 3 & diamagnetic (D) [ Ni ( CO ) 4 ] (IV) sp 3 \& paramagnetic

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

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

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

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

Chemistry · Coordination Compounds

JEE Main 2025 — 29 January, Morning Shift — Question 6

Match List-I with List-II.

List-I (Complex)	List-II (Hybridisation & Magnetic characters)
(A) [ $\left.\mathrm{MnBr}_{4}\right]^{2-}$	(I) $d^2$ $\mathrm{sp}^{3} \&$ diamagnetic
(B) $\left[\mathrm{FeF}_{6}\right]^{3-}$	(II) $\mathrm{sp}^{3}$ $d^2$ & paramagnetic
(C) $\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$	(III) $\mathrm{sp}^{3}$ & diamagnetic
(D) $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$	(IV) $\mathrm{sp}^{3} \&$ paramagnetic

Option A:
(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
Option B:
(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
Option C:
(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
Option D:
(A)-(IV), (B)-(II), (C)-(I), (D)-(III)
Correct

Answer: D

Step-by-step solution

(A) $\left[\mathrm{MnBr}_{4}\right]^{\mathbf{2 -}}$ $\mathrm{Mn}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{5}$ In presence of ligand field

$\Rightarrow \mathrm{sp}^{3}$ hybridization, paramagnetic in nature

(B) $\left[\mathrm{FeF}_{6}\right]^{3-}$ $\mathrm{Fe}^{+3} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{5}$ In presence of ligand field

$\Rightarrow \mathrm{sp}^{3} \mathrm{~d}^{2}$ hybridization, paramagnetic in nature

(C) $\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$ $\mathrm{Co}^{+3} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{6}$ In presence of ligand field

$\Rightarrow \mathrm{d}^{2} \mathrm{sp}^{3}$ hybridization, diamagnetic in nature

(D) $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ $\mathrm{Ni}^{0} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{8} 4 \mathrm{~s}^{2}$ In presence of ligand field

$\Rightarrow \mathrm{sp}^{3}$ hybridization, diamagnetic in nature

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Exam: JEE Main 2025
Paper: 29 January, Morning Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Theories of Bonding in Coordination Compounds

The correct increasing order of stability of the complexes based on Delta 0 value is : (I) [ Mn( CN) 6 ]^3- (II) [ Co( CN) 6 ]^4- (III) […

Answer: D

Step-by-step solution

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