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CAIE IGCSE Chemistry 11.1 Formulae Functional Groups and Terminology Questions

Practise reading displayed structures, applying general formulae, identifying functional groups and naming members of organic homologous series.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • count atoms and bonds in displayed structures to obtain molecular formulae or complete a structure
  • apply the correct general formula to identify or construct a homologous-series member
  • identify functional groups and use them to classify and name the organic compound

Covered syllabus points

11.1.1—And interpret the displayed formula of11.1.2—Write and interpret general formulae11.1.3—Functional group as an atom or group11.1.7—Structural formula is an unambiguous11.1.8—Structural isomers as compounds with11.1.4—Homologous series is a family of11.1.5—Saturated compound has molecules in11.1.6—An unsaturated compound has molecules11.1.9—Homologous series features: same

Question 1

[Maximum number: 1]

The structure of glycine is shown.

Figure for Question 1 — CAIE IGCSE Chemistry

Which row is correct?

formula of glycine

number of different

elements in glycine

CH5O2 N\mathrm{CH}_{5} \mathrm{O}_{2} \mathrm{~N}

10

C2H5O2 N\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{O}_{2} \mathrm{~N}

4

C2H5O2 N\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{O}_{2} \mathrm{~N}

10

H2NCHCOOH\mathrm{H}_{2} \mathrm{NCHCOOH}

4

Question 2

[Maximum number: 1]

Which formula represents an alkene?

A

CH4\mathrm{CH}_{4}

B

C2H4\mathrm{C}_{2} \mathrm{H}_{4}

C

C2H6\mathrm{C}_{2} \mathrm{H}_{6}

D

C2H5OH\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}

Question 3

[Maximum number: 1]

The diagram shows the structures of two organic molecules.

Figure for Question 3 — CAIE IGCSE Chemistry
Figure for Question 3 — CAIE IGCSE Chemistry

Which statement about these molecules is not correct?

A

They are both alcohols.

B

They both produce carbon dioxide and water when they burn in oxygen.

C

They contain different functional groups.

D

They have the same general formula.

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