Test: Isomerism of coordination compounds - JEE MCQ

[Co(en)₃]³⁺, where, en = (NH₂CH₂CH₂NH₂)
The complex show optical isomerism. Optical isomers are mirror image that cannot be superimposed on one another. These are called as enantiomers. The molecules or ions that cannot be superimposed are called chiral.

exhibits fac-mer isomerism.

The two given compounds have same composition but in solution both will give different ions. This type of isomerism is known as ionisation isomerism.

No optical isomerism is exhibited by the given complex as there is a plane of symmetry.
Linkage isomers :-
and
Ionization isomers:-
and
For coordination isomerism, both, cationic and anionic entities are required.

[MA₆] No. of geometrical isomers [MA₅ B] No. of geometrical isomers  Each show 2 geometical isomers
Thus, 3 complexes will show geometrical isomerism.

The number of geometrical isomers is 3 .

the molecular formula of both of the above compounds is same but on ionisation they give different ions in solution, so they are called ionisation isomers.

Complex is not superimposable on its mirror image hence optically active i.e., rotate plane polarized light.

with DMG (dimethylglyoxime) form square planar complex which is obtically inactive. While and are optically active as they do not have P.O.S.