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Optical isomerism: chiral complexes and number of optical isomers

This type of question, asked 4 times: 2021 Paper 21, 29 Jan 2023, 30 Jan 2024, 3 Apr 2025. All 4 questions below, oldest first.

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  1. Question 1

    2021 Paper 21

    52
    The number of optical isomers possible for [Cr(C2O4)3]3−\left\lbrack Cr\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -} is

  2. Question 2

    29 Jan 2023

    43
    Chiral complex from the following is: Here en == ethylene diamine

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  3. Question 3

    30 Jan 2024

    141
    Number of complexes which show optical isomerism among the following is________ cis −[Cr(ox)2Cl2]3−,[Co(en)3]3+-\left\lbrack Cr(ox)_{2}Cl_{2} \right\rbrack^{3 -},\left\lbrack Co(en)_{3} \right\rbrack^{3 +}, cis −[Pt( en )2Cl2]2+-\left\lbrack Pt(\text{~en~})_{2}Cl_{2} \right\rbrack^{2 +}, cis −[Co(en)2Cl2]+-\left\lbrack Co(en)_{2}Cl_{2} \right\rbrack^{+}, trans −[Pt(en)2Cl2]2+-\left\lbrack Pt(en)_{2}Cl_{2} \right\rbrack^{2 +}, trans −[Cr(ox)2Cl2]3−-\left\lbrack Cr(ox)_{2}Cl_{2} \right\rbrack^{3 -}

  4. Question 4

    3 Apr 2025

    48
    The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is  FeCl3+KOH+H2C2O4→ A\ {FeCl}_{3} + KOH + H_{2}C_{2}O_{4} \rightarrow \text{ }A