Q. 22

Write the structu

Answer :

Stereoisomerism is of 2 types:-


Geometrical isomerism.


Optical isomerism


(i) [Co(en)3]Cl3


There are 3 –en groups attached, so it would be tris (ethan-1,2-diamine). The central atom is cobalt and it has +3 charge on it (Each Cl atom contribute to -1 charge and –en has 0 charge and overall the molecule is electrically neutral). So the name stands as:


tris (ethan-1,2-diamine) cobalt(III) chloride.



(ii) [Pt(NH3)2Cl2]


There are 2 –NH3 (ammine) atoms and 2 –Cl (chlorido) atoms but alphabetically, ammine comes before chlorido, so the name starts as ‘diamminedichlorido’. The central atom platinum has +2 charge (as Cl atoms carry -1 charge each and NH3 atoms carry no charge). So the name stands as:


diamminedichloridoplatinum(II)


The geometrical isomers are cis and trans forms.



(iii) [Fe(NH3)4Cl2]Cl


There are 4 –NH3 (ammine) atoms and 2 –Cl (chlorido) atoms but alphabetically, ammine comes before chlorido, so the name starts as ‘tetraamminedichlorido’. The central atom iron has +3 charge (as Cl atoms carry -1 charge each and NH3 atoms carry no charge). So the name stands as:


tetraamminedichlorido iron(III)chloride




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