1.In which of the following pairs both the complexes show optical isomerism?a.cis-[Cr(C2_22O4_44)2_22Cl2_22]3−^{3-}3−, cis-[Co(NH3_33)4_44Cl2_22]+^++b.[Co(en)3_33]Cl3_33, cis-[Co(en)2_22Cl2_22]Clc.[PtCl(dien)]Cl, [NiCl2_22Br2_22]2−^{2-}2−d.[Co(NO3_33)3_33(NH3_33)3_33], cis-[Pt(en)2_22Cl2_22]Login to continueOnly logged in users canattempt or see the solution.