Question

Three arrangements are shown for the complex, $[Co(en)(N{H}_3{)}_{2}B{r}_2{]}^{+}$. Which one is the wrong statement?

• A. I and II are geometrical isomers.
• B. II and III are optical isomers.
• C. I and III are optical isomers.
• D. II and III are geometrical isomers.

Answer 1

Answer: (B)

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.