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CAIE A-Level Chemistry 28.2.3 Terms

Practise classifying mono-, bi- and polydentate ligands from structures, donor atoms and the number of lone pairs donated.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • distinguish mono-, bi-, tri- and polydentate ligands by counting donated lone pairs
  • classify NH3, CN-, en, C2O4 2- and EDTA4- from formulae or displayed structures
  • explain bidentate or tridentate behaviour by linking N or O donor atoms to dative bonds

28.2.3—Terms question 1

[Maximum number: 2]

Titanium is a transition element in Period 4. It is commonly found as TiO2\mathrm{TiO}_{2} in minerals.

Some reactions of TiO2\mathrm{TiO}_{2} are shown in Fig. 3.1.

The anion, acac −^{-}, is a bidentate ligand.

Fig. 3.1

Fig. 3.1

State what is meant by bidentate ligand.

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