plumiMaking and hydrolysing esters: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 6.1.3.2 Making and hydrolysing esters, 2016–2025, with mark schemes and examiner’s reports where available.
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All 26 questions on Making and hydrolysing esters, as a list
- June 2025, Paper 2, Q9 (1 mark): Which reagents could a student use to prepare the ester shown? O CH3CH2 C O O A OH CH3CH2 C + HO CH3CH2 OH + HOOC B C CH3CH2CH2 OH + HOOC O D CH3CH2 C Cl + HO Y
- June 2025, Paper 2, Q21(e) (7 marks): Complete the flowchart for the reactions of pyruvic acid. excess NH3 Acyl chloride Compound P reagent(s) O NaOH(aq) O OH Pyruvic acid CH3OH / H2SO4 reagent(s) O
- June 2024, Paper 2, Q17(d) (2 marks): Esterification reaction of (CH3)3COH Reagent(s) and/or catalyst organic product [2]
- June 2024, Paper 2, Q20(b)(i) (1 mark): What is the systematic name for this ester? [1]
- June 2024, Paper 2, Q20(d) (4 marks): The compound below contains an ester and an amide group. O N O H O Draw the structures of the organic products formed by the complete alkaline hydrolysis of thi
- June 2024, Paper 2, Q23(b)(ii) (1 mark): Another student suggests that adding aqueous sodium hydroxide would be more effective in removing the sulfuric acid catalyst than Na2CO3(aq). Comment on whether
- June 2023, Paper 2, Q14 (1 mark): Which compound(s) is/are hydrolysed by HCl (aq) to produce butanoic acid? 1 CH3CH2CH2COOCH3 2 CH3CH2CH2CH2CN 3 CH3CH2CH2CH2Cl A 1, 2 and 3 B Only 1 and 2 C Only
- June 2023, Paper 3, Q5(b)(ii) (3 marks): In this reaction, 1 mol of aspirin reacts with 3 mol of hot NaOH(aq). Complete the equation for the reaction of aspirin with an excess of hot NaOH(aq). Show str
- June 2023, Paper 3, Q6(e) (6 marks): This question is about nitric acid, hydrochloric acid and sulfuric acid. (e)* Three reactions involving sulfuric acid are shown below. Reaction 1 Dilute sulfuri
- June 2022, Paper 2, Q10 (1 mark): Butyl propanoate is hydrolysed by aqueous sodium hydroxide. Which compound is one of the products of this hydrolysis? A C3H7ONa B C3H5O2Na C C4H9ONa D C4H7O2Na
- June 2022, Paper 2, Q19(b) (4 marks): The structure of 2-hydroxybutanoic acid is shown below. H CH3CH2 C COOH OH 2-hydroxybutanoic acid Fill in the flowchart for reactions involving 2-hydroxybutanoi
- June 2022, Paper 3, Q6(b)(ii) (2 marks): A ‘vitamin C ester’ tablet contains an ester with the molecular formula C22H38O7. This ester can be prepared by reacting vitamin C with a long chain carboxylic
- November 2021, Paper 2, Q6 (1 mark): CH3CH2COOCH3 is heated with aqueous sodium hydroxide to produce two organic products. What are the two organic products? A CH3CH2COOH and CH3OH B CH3CH2COONa an
- November 2021, Paper 2, Q20(a)(iii) (3 marks): Two molecules of salicylic acid can react together in the presence of an acid catalyst to form compound B. Compound B has three rings and a molecular formula of
- November 2020, Paper 2, Q3 (1 mark): Which of these reagent(s) will not react with HOCH2CH2CH2COOH? A NaCN in ethanol B C2H5OH in the presence of an acid catalyst C (CH3CO)2O D concentrated H2SO4 Y
- November 2020, Paper 2, Q9 (1 mark): What is the structural formula of ethyl 3-methylbutanoate? A CH3CH2COOCH2CH2CH(CH3)2 B CH3CH2COOCH(CH3)CH2CH3 C CH3CH2CH(CH3)COOCH2CH3 D (CH3)2CHCH2COOCH2CH3 Yo
- November 2020, Paper 2, Q14 (1 mark): Which of the following reactions produce propan-1-ol? 1 The alkaline hydrolysis of 1-chloropropane. 2 The acid hydrolysis of propyl methanoate. 3 The acid hydro
- June 2019, Paper 2, Q18(a)(i) (1 mark): What is the systematic name of ester A? [1]
- June 2019, Paper 2, Q18(a)(ii) (5 marks): In the boxes, draw the organic products for the reactions of the functional groups in ester A shown below. Each reaction forms two organic products. + H+(aq) O
- June 2019, Paper 2, Q18(a)(iii) (1 mark): Name the type of reactions of ester A shown in (ii). [1]
- June 2018, Paper 2, Q16(c) (3 marks): The flowchart below shows some reactions of compound C. In the boxes, draw the organic products of these reactions. excess CH3OH/H2SO4 Steam COOH HOOC H3PO4 com
- June 2018, Paper 3, Q5(b)(ii) (1 mark): Write the equation for the equilibrium reaction that takes place. [1]
- June 2018, Paper 3, Q5(b)(iii) (1 mark): Draw the skeletal formula of the ester present in the equilibrium mixture. [1]
- June 2017, Paper 2, Q21 (6 marks): 21* Compound L is an organic compound containing carbon, hydrogen and oxygen only. The 1H NMR spectrum of compound L is shown below. The numbers by the peaks ar
- June 2017, Paper 3, Q4(b)(ii) (3 marks): Compound A is heated with a few drops of concentrated sulfuric acid as a catalyst. A cyclic ‘dimer’ of compound A forms. Equation Type of reaction [3]
- June 2017, Paper 3, Q5(a)(ii) (2 marks): Thiols react with carboxylic acids to form thioesters. Write an equation for the reaction of butane-1-thiol with ethanoic acid. Use structures for all organic c
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