The complex that can show optical activity i

Question:

The complex that can show optical activity i

  1. trans- $\left[\mathrm{Cr}\left(\mathrm{Cl}_{2}\right)(\mathrm{ox})_{2}\right]^{3-}$

  2. trans- $\left[\mathrm{Fe}\left(\mathrm{NH}_{3}\right)_{2}(\mathrm{CN})_{4}\right]^{-}$

  3. $c i s-\left[\mathrm{Fe}\left(\mathrm{NH}_{3}\right)_{2}(\mathrm{CN})_{4}\right]^{-}$

  4. cis- $\left[\mathrm{CrCl}_{2}(\mathrm{ox})_{2}\right]^{3-}(\mathrm{ox}=$ oxalate $)$


Correct Option: , 4

Solution:

 Only cis- $\left[\mathrm{CrCl}_{2} \text { (ox) }_{2}\right]^{3-}$ shows optical isomerism while its trans form do not show optical isomerism due to presence of plane of symmetry.

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