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Coordination Compounds — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds5 Marks
Question
 Match the complex species given in Column I with the possible isomerism given in Column II and assign the correct code:

 
Column I (Complex species)
 
Column II (Isomerism)
a.
[Co(NH3)4Cl2]+
1.
Optical
b.
cis-[Co(en)2Cl2]+
2.
Ionisation
c.
[Co(NH3)5 (NO2)]Cl2
3.
Coordination
d.
[Co(NH3)6][Cr(CN)6]
4.
Geometrical
 
 
5.
Linkage

Code:

  1. A (1), B (2), C (4), D (5).
  2. A (4), B (3), C (2), D (1).
  3. A (4), B (1), C (5), D (3).
  4. A (4), B (1), C (2), D (3).
✓

Answer

  1. A (4), B (1), C (2), D (3).
 
Column I (Complex species)
 
Column II (Isomerism)
a.
[Co(NH3)4Cl2]+
4.
Geometrical
b.
cis-[Co(en)2Cl2]+
1.
Optical
c.
[Co(NH3)5 (NO2)]Cl2
2.
Ionisation
d.
[Co(NH3)6][Cr(CN)6]
3.
Coordination

Explanation:

Isomerism in coordination compound is decided by type of ligands and geometry of coordination and arrangement of ligands.

  1. [Co(NH3)4Cl2]+ shows geometrical isomerism due to presence of two types of ligand whose [Co(NH3)4Cl2]+ arrangement around central metal ion.

  1. cis-[Co(en)2Cl2]+ shows optical isomer due to its non-superimposable mirror image relationship.

  1. [Co(NH3)5(NO2)]Cl2 shows ionization isomer due to its interchanging ligand from outside the ionization sphere.
  2. [Co(NH3)6][Cr(CN)6] shows coordination isomer due to interchanging of ligand in between two metal ions from one coordination sphere to another coordination sphere.

Hence, correct choice is (d).

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