Question

Match List-I with List-II

	List-I (Complex)		List-II (Hybridization)
A.	Ni(CO)4	I.	sp3
B.	[Ni(CN)4]2-	II.	sp3d2
C.	[Co(CN)6]3-	III.	d2sp3
D.	[CoF6]3-	IV.	dsp2

Choose the correct answer from the options given below:

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

Answer 1

The Correct Option is B

To solve the given question, we need to determine the correct hybridization for each complex in List-I and match it with List-II. Let's analyze each complex:

1. Ni(CO)₄:
   • NICKEL (Ni) is in the zero oxidation state in \text{Ni(CO)}_{4}.
   • The electronic configuration of Ni is [Ar]3d^{8}4s^{2}.
   • CO is a strong field ligand, causing the pairing of electrons.
   • After electron pairing: 3d^{10}, and the 4s and three 4p orbitals hybridize to form sp^{3} hybridization.
   Therefore, for Ni(CO)₄, the hybridization is sp³. Thus, A matches with I.
2. [Ni(CN)₄]^2-:
   • Ni is in the +2 oxidation state in [\text{Ni(CN)}_{4}]^{2-}.
   • The electronic configuration of Ni²⁺ is [Ar]3d^{8}.
   • CN^- is a strong field ligand, causing the pairing of electrons.
   • Two 3d, one 4s and one 4p orbitals hybridize to form dsp^{2} hybridization.
   Hence, for [Ni(CN)₄]^2-, the hybridization is dsp². Thus, B matches with IV.
3. [Co(CN)₆]^3-:
   • Co is in the +3 oxidation state in [\text{Co(CN)}_{6}]^{3-}.
   • The electronic configuration of Co³⁺ is [Ar]3d^{6}.
   • CN^- is a strong field ligand, causing the pairing of all 3d electrons.
   • Two 3d, one 4s and three 4p orbitals hybridize to form d^{2}sp^{3} hybridization.
   Therefore, for [Co(CN)₆]^3-, the hybridization is d²sp³. Thus, C matches with III.
4. [CoF₆]^3-:
   • Co is in the +3 oxidation state in [\text{CoF}_{6}]^{3-}.
   • The electronic configuration of Co³⁺ is [Ar]3d^{6}.
   • F^- is a weak field ligand and does not cause pairing of the electrons.
   • Five 3d, one 4s and two 4p orbitals hybridize to form sp^{3}d^{2} hybridization.
   Hence, for [CoF₆]^3-, the hybridization is sp³d². Thus, D matches with II.

After analyzing all the complexes, the correct matching is A-I, B-IV, C-III, D-II.