Question

Which one of the following has an optical isomer ?
(en = ethylenediamine)

• A. ${\left[Zn\left(en\right){\left(N{H}_3\right)}_2\right]}^{2+}$
• B. ${\left[Co{\left(en\right)}_3\right]}^{3+}$
• C. ${\left[Co{\left(H_{2}O\right)}_4\left(en\right)\right]}^{3+}$
• D. ${\left[Zn{\left(en\right)}_2\right]}^{2+}$

Answer 1

Answer: (B)

Only option (2) is having non-super imposable mirror image & hence one optical isomer.