Which of the following has an optical isomer ?

Which of the following has an optical isomer ?
  1. $\left[\mathrm{CO}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}\right]^{+}$
  2. $\left[\mathrm{CO}(\text { en })\left(\mathrm{NH}_3\right)_2\right]^{2+}$
  3. $\left[\mathrm{CO}\left(\mathrm{H}_2 \mathrm{O}\right)_4(\mathrm{en})\right]^{3+}$
  4. $\left[\mathrm{CO}(\mathrm{en})_2\left(\mathrm{NH}_3\right)_2\right]^{3+}$

Solution

It is an octahedral complex of the type $\left[\mathrm{M}(\mathrm{AA})_2 \mathrm{X}_2\right]$ Where AA is bidentate ligand.

Asked in: JEE Main 2009

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