Question

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

• A. $\left[Zn\left(en\right)\left(NH_{3}\right)_{2}\right]^{2+}$
• 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.