JEE Advanced 2015 · Paper 2 · Chemistry Q24

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ChemistryInteger+4Question 24 of 60

Among the complex ions, $\ce{[Co(NH2-CH2-CH2-NH2)2Cl2]+}$ , $\ce{[CrCl2(C2O4)2]^{3-}}$ , $\ce{[Fe(H2O)4(OH)2]+}$ , $\ce{[Fe(NH3)2(CN)4]-}$ , $\ce{[Co(NH2-CH2-CH2-NH2)2(NH3)Cl]^{2+}}$ and $\ce{[Co(NH3)4(H2O)Cl]^{2+}}$ , the number of complex ion(s) that show(s) cis-trans isomerism is

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Answer and worked solution

Official answer: 6

Every ion is an octahedral complex whose ligand set allows cis and trans arrangements:

$\ce{[Co(en)2Cl2]+}$ and $\ce{[Co(en)2(NH3)Cl]^{2+}}$ are of type M(AA)₂ab.
$\ce{[CrCl2(ox)2]^{3-}}$ is M(AA)₂a₂.
$\ce{[Fe(H2O)4(OH)2]+}$ and $\ce{[Fe(NH3)2(CN)4]-}$ are Ma₄b₂.
$\ce{[Co(NH3)4(H2O)Cl]^{2+}}$ is Ma₄bc.

Answer: 6

Topics:Isomerism in complexes

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JEE Advanced 2015 · Paper 2, Chemistry question 24