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MCQEasyJEE 2023Ligands & Coordination Number

JEE Chemistry 2023 Question with Solution

The IUPAC name of K3[Co(C2O4)3]K_3[Co(C_2O_4)_3] is

  • A

    Potassium tris(oxalate) cobalte(III)

  • B

    Potassium trioxalatocobalt(III)

  • C

    Potassium tris(oxalate)cobalt(III)

  • D

    Potassium trioxalatocobaltate(III)

Answer

Correct answer:D

Step-by-step solution

Standard Method

Given: The coordination compound is K3[Co(C2O4)3]K_3[Co(C_2O_4)_3].

Find: The correct IUPAC name of this compound.

The IUPAC name of K3[Co(C2O4)3]K_3[Co(C_2O_4)_3] is Potassium trioxalatocobaltate(III).

In naming coordination compounds, the ligands are named first followed by the metal center. The oxidation state of the metal is written in parentheses using Roman numerals.

Therefore, the correct option is D.

Common mistakes

  • Writing cobalt instead of cobaltate is incorrect because the complex ion is anionic. For anionic complexes, the metal name ends with -ate.

  • Using tris(oxalate) here is incorrect in this naming pattern because the accepted IUPAC name given is trioxalato. Name the ligand part exactly as trioxalato before the metal.

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