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Question

Three arrangements are shown for the complex, [Co(en)(NH3)2Br2]+. Which one is the wrong statement?
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A
I and II are geometrical isomers.
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B
II and III are optical isomers.
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C
I and III are optical isomers.
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D
II and III are geometrical isomers.
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Solution

The correct option is B II and III are optical isomers.
I and II are geometrical isomers. I is cis as two Br atoms are adjacent to each other. II is trans as two Br atoms are opposite to each other.
II and III are geometrical isomers. II is trans as two Br atoms are opposite to each other. III is cis as two Br atoms are adjacent to each other.
I and III are optical isomers. They are non-superimposable mirror images of each other.

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