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A reaction of cobalt (III) chloride and ethylenediamine in a 1 : 2 mole ratio generates two isomeric products A (violet coloured) and B (green coloured). A can show optical activity, but B is optically inactive. What type of isomers does A and B represent ?

1. Ionisation isomers
2. Linkage isomers
3. Coordination isomers
4. Geometrical isomers

Correct answer: Geometrical isomers

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