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WBJEE IUPAC Nomenclature — practice questions

Explore 3 free IUPAC Nomenclature questions in WBJEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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IUPAC Nomenclature questions and exercises with answers

Showing questions 1–3 of 3.

The IUPAC name of $K_4[Fe(CN)_6]$ is:Read the answer and worked solution →The IUPAC name of $[Co(NH_3)_5Cl]Cl_2$ is:Read the answer and worked solution →The IUPAC name for the ligand **H₂O** in a coordination compound is:Read the answer and worked solution →

Worked practice questions

The IUPAC name of $K_4[Fe(CN)_6]$ is:

  1. Potassium ferrocyanide
  2. Potassium hexacyanoferrate(II)
  3. Potassium hexacyanoferrate(III)
  4. Potassium ferricyanide
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Correct answer: B. Potassium hexacyanoferrate(II)

Anionic complex with Fe(+2) and 6 CN⁻: 'hexa' (6) + 'cyano' (CN) + 'ferrate' (Fe in anion) + (II) (oxidation state) ⇒ potassium hexacyanoferrate(II). 'Ferrocyanide' is the older/common name.

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The IUPAC name of $[Co(NH_3)_5Cl]Cl_2$ is:

  1. Pentaamminechlorocobalt(II) chloride
  2. Pentaamminechlorocobalt(III) chloride
  3. Tetraamminechlorocobalt(III) dichloride
  4. Hexaamminecobalt(II) chloride
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Correct answer: B. Pentaamminechlorocobalt(III) chloride

**Inside sphere:** 5 NH₃ + 1 Cl. **Charge balance:** Co + 5(0) + (-1) = +2 (since two Cl⁻ outside balance +2) ⇒ Co = +3. Naming alphabetically: amm-ine before chloro? **Actually alphabetical:** 'a' for ammine comes before 'c' for chloro. **Hence:** pentaamminechlorocobalt(III) chloride.

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The IUPAC name for the ligand **H₂O** in a coordination compound is:

  1. Aqua
  2. Hydro
  3. Water
  4. Hydroxo
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Correct answer: A. Aqua

H₂O is named 'aqua'. NH₃ is 'ammine' (double 'm'). CO is 'carbonyl'. OH⁻ is 'hydroxo'.

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More Chemistry topics

Ideal and Non-Ideal SolutionsIdeal SolutionsNon-Ideal SolutionsReactions in Aqueous SolutionElectrochemistryElectrochemical SeriesCoordination CompoundsSolutions