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: Recall the Types of Isomerism in Coordination Complexes 

• Linkage isomerism: Occurs when a ligand can bind to the central metal atom/ion through different atoms (e.g., \( NO_2^- \) via N or O).
• Ionization isomerism: Occurs when counter-ions exchange positions with ligands in the coordination sphere.
• Coordination isomerism: Involves the exchange of ligands between cationic and anionic coordination spheres.
• Solvate isomerism: Involves the exchange of solvent molecules inside and outside the coordination sphere.

Step 2: Analyze Each Complex

• A. \([Co(NH_3)_5(NO_2)]Cl_2\): Shows linkage isomerism as \( NO_2^- \) can bind via either N or O.
• B. \([Co(NH_3)_5(SO_4)]Br\): Shows ionization isomerism, as \( SO_4^{2-} \) and \( Br^- \) can exchange positions.
• C. \([Co(NH_3)_6][Cr(CN)_6]\): Shows coordination isomerism, as ligands can exchange 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 match is:

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