Arenes — Paper 1 · A Level Chemistry 9701

29 A reaction pathway diagram is shown. energy reaction pathway Which reaction does not have such a profile? NaCN A CH3CHO + HCN CH3CH(OH)CN B C2H5Br + NaOH → C2H5OH + NaBr C (CH3)3CBr + NaOH → (CH3)3 COH + NaBr Br D + Br2 Br

1 marks

Answer: B

This question in 9701/13 May/June 2012

30 β-carotene is responsible for the orange colour of carrots. CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 β-carotene β-carotene is oxidised by hot, concentrated, acidified KMnO4. When an individual molecule of β-carotene is oxidised in this way, many product molecules are formed. How many of these product molecules contain a ketone functional group? A 4 B 6 C 9 D 11

1 marks

Answer: B

This question in 9701/11 Oct/Nov 2014

28 In 1869 Ladenburg suggested a structure for benzene, C6H6, in which one hydrogen atom is attached to each carbon atom. CH HC CH CH HC CH Ladenburg structure A compound C6H4Cl 2 could be formed with the same carbon skeleton as the Ladenburg structure. How many structural isomers would this compound have? A 3 B 4 C 5 D 6

1 marks

Answer: A

This question in 9701/11 May/June 2015

20 The diagrams show two different compounds. O O 1 2 What is ● the total number of structural isomers, including compound 2, that could be formed by adding a second methyl group to the ring of compound 1, ● the number of π electrons in each compound? number of number of isomers π electrons A 3 2 B 3 4 C 5 2 D 5 4

1 marks

Answer: D

This question in 9701/11 May/June 2016

36 Catalytic converters are used to modify exhaust emissions from motor vehicles. Which reactions occur in catalytic converters? 1 C8H18 + 12 2 1 O2 → 8CO2 + 9H2O 2 2NO + 2CO → N2 + 2CO2 3 NO + SO3 → NO2 + SO2

1 marks

Answer: B

This question in 9701/11 Oct/Nov 2016

28 Which statement about the use of alkane fuels in internal combustion engines is correct? A C8H18 is used as fuel in internal combustion engines and reacts with oxygen and nitrogen from the air. B In limited oxygen, CO is produced which oxidises SO2 to SO3 in the atmosphere. C The catalytic converter removes polluting gases including NO2 and CO2. D Unburnt hydrocarbons and NO2 can react in sunlight to produce photochemical smog.

1 marks

Answer: D

This question in 9701/12 Oct/Nov 2020

30 Limonene is found in lemon and orange oils. limonene What is the major product when limonene reacts with an excess of dry hydrogen chloride? A B C D Cl Cl Cl Cl Cl Cl

1 marks

Answer: C

This question in 9701/13 May/June 2022

29 The fumes from the exhausts of petrol-burning cars contain the following pollutants. 1 unburnt hydrocarbons 2 nitrogen dioxide 3 carbon monoxide Which pollutants are removed by oxidation in a catalytic converter? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 9701/11 Oct/Nov 2025

39 Some properties of compound X are listed. ● 1.0mol X reacts with exactly 8.5mol oxygen when completely combusted. ● X does not react when heated with acidified KMnO4. What are the possible identities of X? OH 1 2 HO 3 4 OH O A 1 and 3 B 2 and 4 C 3 only D 4 only

1 marks

Answer: B

This question in 9701/11 Oct/Nov 2025

39 Some properties of compound X are listed. ● 1.0mol X reacts with exactly 8.5mol oxygen when completely combusted. ● X does not react when heated with acidified KMnO4. What are the possible identities of X? OH 1 2 HO 3 4 OH O A 1 and 3 B 2 and 4 C 3 only D 4 only

1 marks

Answer: B

This question in 9701/13 Oct/Nov 2025