Number of complexes which show optical isomerism among the following is _____. [2024]
Cis-[Cr(ox)2Cl2]3-,[Co(en)3]3+,cis-[Pt(en)2Cl2]2+,cis-[Co(en)2Cl2]+,trans-[Pt(en)2Cl2]2+,trans-[Cr(ox)2Cl2]3-
(4)
cis-[Cr(ox)2Cl2]3-, cis-[Pt(en)2Cl2]2+, cis-[Co(en)2Cl2]+ and [Co(en)3]3+ are optically active
trans-[Pt(en)2Cl2]2+,trans-[Cr(ox)2Cl2]3- are optically inactive