Engineering
Chemistry
Isomerism in Coordination Compounds
Question

Two isomers of a compound [Co(NH3)3Cl3](Ma3B3 type) are shown in the figures. The isomers can be classified as:

(i) fac-isomers (ii) mer-isomer
(i) optical-isomer (ii) trans-isomer
(i) mer-isomer (ii) fac-isomer
(i) trans-isomer (ii) cis-isomer.
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Solution
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In fac-isomer, three Cl atoms are present on one face of the octahedron. Similarly, 3 ammonia molecules are present on one face of the octahedron. All 3 same ligands have 90º bond angle between them. 

In mer-isomer, there is a 90º ; 90º ; 180º bond angle between three same ligands.

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