Question

Match List I with List II

List-I (Complex)		List-II (Type of isomerism)
(A)	[Co(NH3)5(NO2)]Cl2	(I)	Solvate isomerism
(B)	[Co(NH3)5(SO4)]Br	(II)	Linkage isomerism
(C)	[Co(NH3)6] [Cr(CN)6]	(III)	Ionization isomerism
(D)	[Co(H2O)6]Cl3	(IV)	Coordination isomerism

Choose the correct answer from the options given below:

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

Answer 1

The Correct Option is A

Step 1: Review Isomerism Types in Coordination Complexes

• Linkage Isomerism: A ligand can attach to the central metal atom/ion via different atoms (e.g., \( NO_2^- \) through N or O).
• Ionization Isomerism: Counter-ions can swap places with ligands within the coordination sphere.
• Coordination Isomerism: Involves ligand exchange between separate cationic and anionic coordination spheres.
• Solvate Isomerism: Solvent molecules can interchange between being inside and outside the coordination sphere.

Step 2: Analyze Each Complex

• A. \([Co(NH_3)_5(NO_2)]Cl_2\): Exhibits linkage isomerism due to the dual binding capability of \( NO_2^- \) (N or O).
• B. \([Co(NH_3)_5(SO_4)]Br\): Demonstrates ionization isomerism via potential exchange between \( SO_4^{2-} \) and \( Br^- \).
• C. \([Co(NH_3)_6][Cr(CN)_6]\): Displays coordination isomerism through ligand migration between the Co and Cr coordination spheres.
• D. \([Co(H_2O)_6]Cl_3\): Shows solvate isomerism, as water molecules can exchange with the solvent.

Step 3: Match List I with List II

• A-II: Linkage isomerism.
• B-III: Ionization isomerism.
• C-IV: Coordination isomerism.
• D-I: Solvate isomerism.

Step 4: Conclusion

The correct pairings are:

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