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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.

Question 4

[Maximum number: 1]

An alkene is represented by the formula CH3CH=CH2\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}.
Which name is given to this type of formula?

A

displayed

B

empirical

C

general

D

structural

Question 5

[Maximum number: 1]

Many organic compounds contain carbon and hydrogen only.

Carboxylic acids and esters contain carbon, hydrogen and oxygen only.

An ester X and a carboxylic acid Y both contain 3 carbon atoms.
X and Y have the same molecular formula.

State the name given to compounds with the same molecular formula but different structural formulae.

Question 6

[Maximum number: 1]

Which statement about homologous series is correct?

A

Members of a homologous series have the same structural formula.

B

Members of a homologous series all have similar chemical properties.

C

Members of a homologous series all have similar physical properties.

D

Members of all homologous series are hydrocarbons.

Question 7

[Maximum number: 1]

The table shows the structures of four hydrocarbons.

Table for Question 7 — CAIE IGCSE Chemistry

Compound P is saturated.

What is meant by the term saturated?

Question 8

[Maximum number: 1]

Which statement about unsaturated hydrocarbons is correct?

A

CH3CH2CH=CHCH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CHCH}_{3} is an unsaturated hydrocarbon.

B

Ethene has more hydrogen atoms per molecule than ethane.

C

Unsaturated hydrocarbons have double bonds between carbon and hydrogen atoms.

D

Unsaturated hydrocarbons turn aqueous bromine from colourless to brown.

Question 9

[Maximum number: 1]

Which statement about a homologous series is correct?

A

All members have the same general formula.

B

All members have the same molecular formula.

C

All members have similar physical properties.

D

Members show a trend in their chemical properties.

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