Which one of the following has an optical isomer ?

Question:

Which one of the following has an optical isomer ?

  1. $\left[\mathrm{Zn}(\mathrm{en})_{2}\right]^{2+}$

  2. $\left[\mathrm{Zn}(\mathrm{en})\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+}$

  3. $\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$

  4. $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}(\mathrm{en})\right]^{3+}(\mathrm{en}=$ ethylenediamine)


Correct Option: , 3

Solution:

Solution not required

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