Q. 3

Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers:

(i) K[Cr(H2O)2(C2O4)2

(ii) [Co(en)3]Cl3

(iii) [Co(NH3)5(NO2)](NO3)2

(iv) [Pt(NH3)(H2O)Cl2]

Answer :

(i) K[Cr(H2O)2(C2O4)2 exhibits geometrical isomerism (Cis and trans) and optical isomerism of cis and trans type.


(ii) Optical isomerism exhibiting mirror images.


(iii) Ionisation isomerism- [Co(NH3)5(NO3)](NO3)(NO2) and


Linkage isomerism-[Co(NH3)5(ONO)](NO3)2


(iv) Geometrical isomers are seen in [Pt(NH3)(H2O)Cl2]


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