List-I (Complex) List-II (Hybridisation & Magnetic characters) (A) [MnBr4]^(2-) (I) d^2sp^3 & diamagnetic

Question

Match List-I with List-II. 

List-I (Complex)		List-II (Hybridisation & Magnetic characters)
(A)	\([MnBr_4]^{2-}\)	(I)	\(d^2sp^3\) \(\&\) diamagnetic
(B)	\([FeF_6]^{3-}\)	(II)	\(sp^3d^2\) \(\&\) paramagnetic
(C)	\([Co(C_2O_4)_3]^{3-}\)	(III)	\(sp^3\) \(\&\) diamagnetic
(D)	\([Ni(CO)_4]\)	(IV)	\(sp^3\) \(\&\) paramagnetic

Choose the correct answer from the options given below : 

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

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

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

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

Answer 1

Correct option is (4) (A)-(IV), (B)-(II), (C)-(I), (D)-(III)

(A) \([MnBr_4]^2-\)  

\(\mathrm{Mn}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{5}\)  

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) \(\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}\) 

\(Co^{+3} \Rightarrow[Ar]\ 3d^6\)

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