The number of complexes that show optical iso | vedclass

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Question

(C) $1. cis-[Cr(ox)_2 Cl_2]^{3-}$: This complex lacks both a plane of symmetry $(POS)$ and a center of symmetry $(COS)$,so it shows optical isomerism.

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$4$

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(C) $1. cis-[Cr(ox)_2 Cl_2]^{3-}$: This complex lacks both a plane of symmetry $(POS)$ and a center of symmetry $(COS)$,so it shows optical isomerism.$2. [Co(en)_3]^{3+}$: This complex is chiral and lacks $POS$ and $COS$,so it shows optical isomerism.$3. cis-[Pt(en)_2 Cl_2]^{2+}$: This complex lacks $POS$ and $COS$,so it shows optical isomerism.$4. cis-[Co(en)_2 Cl_2]^{+}$: This complex lacks $POS$ and $COS$,so it shows optical isomerism.$5. trans-[Pt(en)_2 Cl_2]^{2+}$: This complex possesses both $POS$ and $COS$,so it is optically inactive.$6. trans-[Cr(ox)_2 Cl_2]^{3-}$: This complex possesses both $POS$ and $COS$,so it is optically inactive.Therefore,the total number of complexes showing optical isomerism is $4$.

The number of complexes that show optical isomerism among the following is $ . . . . . . $.
$cis-[Cr(ox)_2 Cl_2]^{3-}, [Co(en)_3]^{3+}$
$cis-[Pt(en)_2 Cl_2]^{2+}, cis-[Co(en)_2 Cl_2]^{+}$
$trans-[Pt(en)_2 Cl_2]^{2+}, trans-[Cr(ox)_2 Cl_2]^{3-}$

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The number of complexes that show optical isomerism among the following is $ . . . . . . $.$cis-[Cr(ox)_2 Cl_2]^{3-}, [Co(en)_3]^{3+}$$cis-[Pt(en)_2 Cl_2]^{2+}, cis-[Co(en)_2 Cl_2]^{+}$$trans-[Pt(en)_2 Cl_2]^{2+}, trans-[Cr(ox)_2 Cl_2]^{3-}$