Answer :

A.[Co(NH3)4Cl2]+ shows geometrical isomerism due to different geometric arrangements of the ligands.

B Cis-[Co(en)2Cl2]+ shows optical isomerism because the two (Dextro d and laevo l) mirror images formed cannot be superimposed on one another.

C.[Co(NH3)5(NO2)]Cl2 shows linkage isomerism because it contains ambidentate ligand NO2.

D.[Co(NH3)6][Cr(CN)6] shows coordination isomerism due to interchanging of ligands between ionic entities.

The correct answer will be the option (iii) A (4) B (1) C (5) D (3).

Hence, matching the two columns the right combination will be:

A. [Co(NH3)4Cl2]+ -4. geometrical

B. Cis-[Co(en)2Cl2]+-1. optical

C. [Co(NH3)5(NO2)]Cl2-5. linkage

D. [Co(NH3)6][Cr(CN)6] -3. Coordination.

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