Formulae, functional groups and terminology — Paper 1 · IGCSE Chemistry (9-1) 0971

36 Four organic compounds are listed. ethane ethanoic acid ethanol ethene Which bond do all four compounds contain? A C–C B C–H C C–O D O–H

1 marks

Answer: B

This question in 0971/11 May/June 2018

37 The first three members of a homologous series are shown. F F F F F F F C F F C C F F C C C F F F F F F F Why do these molecules represent a homologous series? A because they contain fluorine and carbon atoms B because they have saturated bonds C because they have the same functional group D because they react differently from each other

1 marks

Answer: C

This question in 0971/11 May/June 2018

34 What is the structure of ethanol? A B C D H H H H H O H H C C H C C H H C C H C C OH H H H H H OH H H

1 marks

Answer: D

This question in 0971/11 May/June 2019

36 The structures of three compounds are shown. H H H H H H H C C Br H C Br H C C C Br H H H H H H Which statement explains why these three compounds have similar chemical properties? A They all contain bromine, carbon and hydrogen. B They all contain the same functional group. C They are all carbon-based molecules. D They are all saturated molecules.

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2019

36 Which statement about members of a homologous series is correct? A They are elements with the same chemical properties. B They are compounds with the same functional group. C They are atoms with the same number of outer electrons. D They are molecules with the same boiling point.

1 marks

Answer: B

This question in 0971/11 May/June 2020

36 The structures of four compounds are shown. 1 2 3 4 H H H H H H H H H H C C H C C H C C O H H C C C H H H H H H H H H H Which compounds are members of the same homologous series? A 1 and 2 only B 1 and 4 C 1, 2 and 3 D 2 and 4

1 marks

Answer: B

This question in 0971/12 May/June 2020

34 The structure of an organic molecule is shown. H H H H O H O C C C C C O H H H Which functional groups does this molecule contain? carboxylic alcohol alkene acid A no no no B no yes yes C yes no yes D yes yes yes

1 marks

Answer: D

This question in 0971/11 May/June 2021

35 Which compounds belong to the same homologous series? A ethane and propane B ethanoic acid and ethanol C methane and ethene D propene and ethanoic acid

1 marks

Answer: A

This question in 0971/11 May/June 2021

36 Which compound belongs to a different homologous series to the others? A B C D H H H H O H OH H H C OH H C C OH H C C OH H C C C H H H H H H H H

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2021

35 In which lists are the compounds in the same homologous series? 1 CH4, C2H4, C3H8 2 CH3OH, C2H5OH, C3H7OH 3 CH3CO2H, CH3CH2OH, CH3CH2CH2OH A 1 and 2 B 1 and 3 C 2 only D 3 only

1 marks

Answer: C

This question in 0971/11 May/June 2022

32 Compound J is an unsaturated carboxylic acid. Which bonds are present in a molecule of J? C=C C=O O-H A v v v B x v v Cc v x x D x v x key /=yes X =no

1 marks

Answer: A

This question in 0971/12 May/June 2022

32 Part of the structure of a molecule of vitamin A is shown. H H C H H H C C C C C O H H H H Which statements about this part of the structure are correct? 1 It is saturated. 2 There are two alkene groups. 3 The structure shows a carboxylic acid. A 1 and 3 B 1 only C 2 and 3 D 2 only

1 marks

Answer: D

This question in 0971/11 May/June 2023

32 Which row shows the general formula for alkenes and for alcohols? alkenes alcohols A CnH2n CnH2n+1COOH B CnH2n CnH2n+1OH C CnH2n+2 CnH2n+1COOH D CnH2n+2 CnH2n+1OH

1 marks

Answer: B

This question in 0971/12 May/June 2023

8 The diagram shows the structure of a molecule of ethyl ethanoate. H O H C C H H H O C C H H H What is the molecular formula of a molecule of ethyl ethanoate? A CHO B C4H8O2 C C4(H2)2(O2) D C2H4O

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2023

34 Which diagram shows the displayed formula for the named organic compound? A B C D H O H H H O H H H H C C O O H H C C H H C C H H C C H H H H H H H H ethanoic acid ethene ethanol methane

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2023

33 The structures of four organic compounds are shown. 1 2 3 4 H H H H H H H C C OH C C H C H H C H H H H H OH H Which compounds are members of the same homologous series? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 3 and 4

1 marks

Answer: C

This question in 0971/12 May/June 2024

35 Which statement describes a homologous series? A a family of elements in the same group of the Periodic Table B a family of elements with similar chemical properties C a family of compounds with the same functional group D a family of compounds with similar physical properties

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2024

33 Which row identifies compounds in the same homologous series? chemical functional properties group A different different B different same C similar different D similar same

1 marks

Answer: D

This question in 0971/11 May/June 2025

10 The diagrams show the structures of four molecules. H H H H H O H H H O H C C H H C C H H C C C H H C C C H H C C H H C O H H H H H H H Which statement about these molecules is correct? A All four molecules have different molecular formulae. B All four molecules have the same molecular formula. C Only two molecules have the same molecular formula. D Only three molecules have the same molecular formula.

1 marks

Answer: D

This question in 0971/12 May/June 2025

32 The formulae for three organic compounds are listed. 1 C2H4 2 C4H8 3 C4H10 Which compounds belong to the same homologous series? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 0971/12 May/June 2025

35 L and M are different homologous series. The first three members of homologous series L all decolourise aqueous bromine. The first three members of homologous series M all dissolve in water to give solutions with a pH below 7. What are the general formulae for homologous series L and M? homologous homologous series L series M A CnH2n CnH2n+1COOH B CnH2n CnH2n+1OH C CnH2n+2 CnH2n+1OH D CnH2n+2 CnH2n+1COOH

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2025