Formulae, functional groups and terminology — Paper 2 · IGCSE Chemistry (9-1) 0971

39 Which structural formula represents methyl propanoate? A CH3CH2COOCH3 B CH3COOCH2CH2CH3 C CH3CH2CH2COOCH3 D HCOOCH2CH2CH3

1 marks

Answer: A

This question in 0971/21 May/June 2018

5 How many electrons are used to form covalent bonds in a molecule of methanol, CH3OH? A 5 B 6 C 8 D 10

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2018

36 Why is ethanol a member of the homologous series of alcohols but propane is not? A Ethanol has two carbon atoms per molecule but propane has three. B Ethanol can be made from ethene but propane is obtained from petroleum. C Ethanol is a liquid but propane is a gas. D Ethanol contains the same functional group as other alcohols but propane does not.

1 marks

Answer: D

This question in 0971/21 May/June 2019

39 The structure of an ester is shown. O CH3 C OCH2CH2CH3 What is the name of the ester? A ethyl propanoate B methyl propanoate C propyl ethanoate D propyl methanoate

1 marks

Answer: C

This question in 0971/21 May/June 2019

36 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.

1 marks

Answer: B

This question in 0971/21 May/June 2020

36 Which statement about compounds in the same homologous series is correct? A They have the same chemical properties because they have the same number of carbon atoms. B They have the same physical properties because they have the same number of carbon atoms. C They have different chemical properties because they have different numbers of carbon atoms. D They have different physical properties because they have different numbers of carbon atoms.

1 marks

Answer: D

This question in 0971/22 May/June 2020

36 Which structures are structural isomers of each other? 1 2 H H H H H H H H C C C C H H C C C H H H H H H H H C H H 3 4 H H H H H H H C C C H H C C C H H H H H H C H H C H H H A 1, 2, 3 and 4 B 1, 2 and 4 only C 1 and 3 only D 2 and 4 only

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2020

35 Which statement about homologous series and isomerism is correct? A Butane and butene are structural isomers. B Compounds in the same homologous series have the same general formula. C Compounds in the same homologous series have the same molecular formula. D Structural isomers have different molecular formulae.

1 marks

Answer: B

This question in 0971/21 May/June 2021

35 The structures of four organic molecules are shown. H H O H H O H C Cl H C O H H C C O H H C H H H H H How many different homologous series are represented by these molecules? A 1 B 2 C 3 D 4

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2021

35 The structure of ester W is shown. H O H C C H H O C H H Which row gives the names of ester W and the carboxylic acid and alcohol from which it is made? name of ester W carboxylic acid alcohol A ethyl methanoate ethanoic acid methanol B ethyl methanoate methanoic acid ethanol C methyl ethanoate ethanoic acid methanol D methyl ethanoate methanoic acid ethanol

1 marks

Answer: C

This question in 0971/21 May/June 2022

8 Caffeine is a stimulant found in coffee. O CH3 H3C C N N C C H C C N O N CH3 caffeine Which formula represents caffeine? A C7H10N4O2 B C8H10N3O2 C C8H10N4O2 D C8H11N4O2

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2022

34 Which compound has the most –CH2– groups in one molecule? A butane B butanoic acid C butan-1-ol D but-1-ene

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2022

33 The structural formula of compound Q is given. CH3CH2CH2COOCH2CH2CH3 What is compound Q? A butyl butanoate B butyl propanoate C propyl butanoate D propyl propanoate

1 marks

Answer: C

This question in 0971/21 May/June 2023

30 The hydrocarbon C4H8 has two structural isomers, but-1-ene and but-2-ene. Which statement is correct? A But-2-ene has the structural formula CH3CH=CHCH3 and the same general formula as butane. B But-2-ene has the structural formula CH3CH=CHCH3 and the same empirical formula as ethene. C But-1-ene has the structural formula CH3CH2CH=CH2 and the same general formula as butane. D But-1-ene has the structural formula CH3CHCH2=CH and the same empirical formula as ethene.

1 marks

Answer: B

This question in 0971/22 May/June 2023

7 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 0971/22 Oct/Nov 2023

33 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 0971/22 Oct/Nov 2023

38 The formulae of five compounds are listed. 1 C4H10 2 C2H5OH 3 C4H9OH 4 C4H9COOH 5 C5H11OH Which compounds are in the same homologous series? A 1, 3 and 4 B 2, 3 and 5 C 3 and 4 only D 3 and 5 only

1 marks

Answer: B

This question in 0971/21 May/June 2024

35 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.

1 marks

Answer: A

This question in 0971/22 May/June 2024

32 Which statement about compounds in the same homologous series is correct? A They have the same chemical properties because they have the same number of carbon atoms. B They have the same physical properties because they have the same number of carbon atoms. C They have different chemical properties because they have different numbers of carbon atoms. D They have different physical properties because they have different numbers of carbon atoms.

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2024

33 Methanol reacts with ethanoic acid to form an ester. What is the displayed formula for this ester? A B O H O H H H C O C H H C O C C H H H H C D H O H H O H H H C C O C H H C C O C C H H H H H H

1 marks

Answer: C

This question in 0971/22 May/June 2025

32 The alkenes are a homologous series. Which statement about the members of the homologous series of the alkenes is correct? A They have the same functional group. B They have the same relative molecular mass. C They have different chemical properties. D They have different general formulae.

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2025

34 Which structures are structural isomers of each other? H H H H H H H H C C C C H H C C C H H H H H H H H C H H 1 2 H H H H H H H C C C H H C C C H H H H H H C H H C H H H 3 4 A 1, 2, 3 and 4 B 1, 2 and 4 only C 1 and 3 only D 2 and 4 only

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2025

35 The structure of an ester is shown. H H O H H C C C O C H H H H What is the name of this ester? A ethyl methanoate B methyl ethanoate C propyl methanoate D methyl propanoate

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2025