Question:
Draw all the isomers (geometrical and optical) of:
(i) [CoCl2(en)2]+
(ii) [Co(NH3)Cl(en)2]2+
(iii) [Co(NH3)2Cl2(en)]+
Solution:
(i) [CoCl2(en)2]+
Geometrical isomerism
Optical isomerism
Since only cis isomer is optically active, it shows optical isomerism.
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In total, three isomers are possible.
(ii) [Co(NH3)Cl(en)2]2+
Geometrical isomerism
Optical isomerism
Since only cis isomer is optically active, it shows optical isomerism.
(iii) [Co(NH3)2Cl2(en)]+
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