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In which of the following pairs both the complexes show optical isomerism? (AFMC 2009)
(a) cis - \( \left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{2} \mathrm{Cl}_{2}\right]^{3-} \), cis - \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right] \)
(b) \( \left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{3} \), cis - \( \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl} \)
(c) \( [\mathrm{PtCl} \) (dien) \( ] \mathrm{Cl},\left[\mathrm{NiCl}_{2} \mathrm{Br}_{2}\right]^{2-} \)
\( \mathrm{P} \)
WV
(d) \( \left[\mathrm{Co}\left(\mathrm{NO}_{3}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right] \), cis - \( \left[\mathrm{Pt}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \)
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