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

1. $\left[\mathrm{Zn}(\mathrm{en})\left(\mathrm{NH}_3\right)_2\right]^{2+}$
2. $\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}$
3. $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_4(\text { en })\right]^{3+}$
4. $\left[\mathrm{Zn}(\text { en })_2\right]^{2+}$

Solution

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

Asked in: JEE Main 2010

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