Test: Isomerism in Coordination Compounds (January 1) - NEET MCQ

Optical isomers have mirror images that cannot be superimposed on one another. These are called as enantiomers. The molecules or ions that cannot be superimposed are called chiral.

The complex [Co(NH₃)₄Br₂]CI show geometrical and ionisation isomerism.

Ionisation isomerism is due to the exchange of groups between the complex ion and the ions outside it, e.g. [Cr(H₂O)₄CI(NO₂)CI] and [Cr(H₂O)₄CI₂]NO₂ show ionisation isomerism. 

[CoNH₃CI₃] do not exhibit optical isomerism. Optical isomerism is shown by M(AA)₂X₂ type, M(AA)₃ type , [M(AA) B₂X₂] type complexes containing hexadentate ligand and ML_a L_b L_c L_d Left type.

cis platin is used as anticancer drug.

Geometrical isomerism is not observed in complexes of coordination number 4 having tetrahedral geometry. The platinumglycinato complex [ Pt(gly)2 show geometrical isomerism (cis and trans form).

For O.S:

X + 0 + 2(-1) = 1

X = 3

Coordination number is the number of molecules linked to the central atom.

Hence B is the correct answer.

For a complex of the type MABCD, three geometrical isomers are possible.

The complex has cis and trans isomers. The c/s has non-superimposable mirror images. Hence, total are 3.

[Mabcd] type complexes exist in three isomeric forms.