Organic reactions: OCR A‑Level Chemistry B questions

Every OCR A-Level Chemistry B exam question on WM Organic reactions (specification points WM(c)–(g)), 2016–2025, with its mark scheme and examiner’s report.

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2,049 questions

Q3
June 2025 · Paper 1
1 markWM Organic reactions
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Q31(d)(i)
June 2025 · Paper 1
1 markWM Organic reactions
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Q31(d)(ii)
June 2025 · Paper 1
2 marksWM Organic reactions
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Q32(a)(i)
June 2025 · Paper 1
2 marksWM Organic reactions
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Q32(a)(ii)
June 2025 · Paper 1
3 marksWM Organic reactions
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Q32(b)(i)
June 2025 · Paper 1
3 marksWM Organic reactions
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Q32(b)(ii)
June 2025 · Paper 1
1 markWM Organic reactions
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Q32(c)(i)
June 2025 · Paper 1
1 markWM Organic reactions
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Q32(c)(iii)
June 2025 · Paper 1
3 marksWM Organic reactions
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Q16
June 2025 · AS Paper 1
1 markWM Organic reactions
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Q17
June 2025 · AS Paper 1
1 markWM Organic reactions
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Q21(b)
June 2025 · AS Paper 1
2 marksWM Organic reactions
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Q21(c)
June 2025 · AS Paper 1
5 marksWM Organic reactions
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Q2(c)(i)
June 2025 · AS Paper 2
1 markWM Organic reactions
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Q4(a)(ii)
June 2025 · AS Paper 2
1 markWM Organic reactions
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Q4(a)(iii)
June 2025 · AS Paper 2
1 markWM Organic reactions
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Q9
June 2024 · Paper 1
1 markWM Organic reactions
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Q34(d)
June 2024 · Paper 1
3 marksWM Organic reactions
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Q1(b)
June 2024 · Paper 2
2 marksWM Organic reactions
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Q2(b)
June 2024 · Paper 3
2 marksWM Organic reactions
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All 137 questions on Organic reactions, as a list

June 2025, Paper 1, Q3 (1 mark): An organic compound A is oxidised to a different compound which forms a silver mirror with Tollens’ reagent. Which could be compound A? A propanal B propan-1-ol
June 2025, Paper 1, Q31(d)(i) (1 mark): State the type of reaction that occurs between oleic acid and glycerol. [1]
June 2025, Paper 1, Q31(d)(ii) (2 marks): Write a balanced equation for the reaction between oleic acid, C17H33COOH, and glycerol. [2]
June 2025, Paper 1, Q32(a)(i) (2 marks): Complete the equation below by drawing the skeletal formula of a suitable carboxylic acid and suggesting a suitable catalyst. catalyst: O HO + butan-1-ol O + H2
June 2025, Paper 1, Q32(a)(ii) (3 marks): After synthesis, the ester can be separated from the reaction mixture by distillation. Draw a labelled diagram to show how equipment is set up for distillation.
June 2025, Paper 1, Q32(b)(i) (3 marks): They react with acid anhydrides to form esters. Ethanoic anhydride reacts with phenol to form an ester and one other product. Show the structures of these compo
June 2025, Paper 1, Q32(b)(ii) (1 mark): Sodium phenoxide can be made from phenol. Explain whether sodium carbonate or sodium hydroxide should be used for this synthesis. [1]
June 2025, Paper 1, Q32(c)(i) (1 mark): Give suitable conditions for this reaction. [1]
June 2025, Paper 1, Q32(c)(iii) (3 marks): The dehydration of butan-2-ol also makes but-1-ene. Suggest, with reasons, whether butan-1-ol or butan-2-ol would be better for making but-1-ene. [3]
June 2025, AS Paper 1, Q16 (1 mark): What is a reaction of methanol, CH3OH? A It can be dehydrated to an alkene. B It can be esterified using another alcohol. C It can be oxidised to a ketone. D It
June 2025, AS Paper 1, Q17 (1 mark): A compound has the formula: OH What is a reaction of this compound? A It can be oxidised by acid dichromate(VI) to an aldehyde. B It gives a purple colour with
June 2025, AS Paper 1, Q21(b) (2 marks): An aromatic product is formed when bisphenol A reacts with ethanoic anhydride, (CH3CO)2O. Complete the skeletal formula of this aromatic product. [2]
June 2025, AS Paper 1, Q21(c) (5 marks): Bisphenol A can be purified by recrystallisation from dilute ethanoic acid. Describe the steps in this procedure, stating where soluble and insoluble impurities
June 2025, AS Paper 2, Q2(c)(i) (1 mark): The alkene has a boiling point of 30 °C and is highly flammable. Suggest a practical arrangement that the student should use to avoid loss of the alkene as a va
June 2025, AS Paper 2, Q4(a)(ii) (1 mark): Give the reaction conditions that the student should use for this esterification reaction. [1]
June 2025, AS Paper 2, Q4(a)(iii) (1 mark): Write a structural formula for the ester produced in this reaction. [1]
June 2024, Paper 1, Q9 (1 mark): Which compound will react with sodium carbonate? A CH3COCH3 B CH3COOCH3 C CH3CH2CH2OH D CH3CH2COOH Your answer [1]
June 2024, Paper 1, Q34(d) (3 marks): Alcohols can be dehydrated by heating with concentrated sulfuric acid. When dehydrated, CH3CH2CH(OH)CH3 produces a mixture of three isomeric products. Draw the
June 2024, Paper 2, Q1(b) (2 marks): Long-chain carboxylic acids can be identified by converting them to their methyl esters and then using gas–liquid chromatography. Write the equation for the con
June 2024, Paper 3, Q2(b) (2 marks): Describe a simple test-tube test that could confirm the formation of oil of wintergreen. [2]
June 2024, Paper 3, Q2(c) (6 marks): ‘Oil of wintergreen’ is used by athletes to warm their muscles. It can be synthesised in the laboratory from aspirin tablets. The reaction is shown. O CH3 H3C O
June 2024, Paper 3, Q2(d)(i) (2 marks): The students shake the impure product with sodium hydrogencarbonate solution in a separating funnel. Which impurities are removed by doing this and what is seen
June 2024, Paper 3, Q2(d)(ii) (2 marks): The students then add ether to the separating funnel. Oil of wintergreen and aspirin are insoluble in cold water, but very soluble in ether. The density of ethe
June 2024, Paper 3, Q2(d)(iii) (1 mark): Ether is volatile and very flammable. How could oil of wintergreen be obtained from the ether layer? [1]
June 2024, AS Paper 1, Q8 (1 mark): An impure organic liquid is being purified after preparation. The liquid is insoluble in water. Why is a separating funnel used? A To complete the distillation.
June 2024, AS Paper 1, Q15 (1 mark): What is a property of the compound shown? CO2H OH A It can be oxidised to a carbonyl compound. It gives a purple colour with neutral FeCl 3. B C It is neutral i
June 2024, AS Paper 1, Q16 (1 mark): An impure solid is purified by recrystallisation. What is correct? A Insoluble impurities are removed by filtration at the end of the process. B Soluble impurit
June 2024, AS Paper 1, Q23(e)(ii) (1 mark): Explain why the Cativa process is ‘greener’ than the Monsanto process. [1]
June 2024, AS Paper 2, Q2(f) (2 marks): 1-chloropropane, CH3CH2CH2Cl, is another organic compound containing chlorine. 1-chloropropane is made by reacting propan-1-ol, CH3CH2CH2OH, with concentrated h
June 2023, Paper 1, Q4 (1 mark): One of the principles of green chemistry in industrial processes involves the use of a selective catalyst. Which of the following makes a selective catalyst ‘gr
June 2023, Paper 1, Q16 (1 mark): Which compound can undergo an elimination reaction to produce an alkene? A (CH3)3CH B C6H5OH C C6H5CH2OH D CH3CH(CH3)CH2OH Your answer [1]
June 2023, Paper 1, Q17 (1 mark): An organic liquid is being purified. The liquid does not mix with water and contains a small aqueous acidic impurity. What is the correct order for the followin
June 2023, AS Paper 1, Q12 (1 mark): A liquid is insoluble in water. It is purified from an aqueous solution in which it has been prepared. One stage in the purification is allowing the liquid to s
June 2023, AS Paper 2, Q3(b)(i) (2 marks): Describe and explain how the student should modify this part of their technique in order to obtain more recrystallised product. [2]
June 2023, AS Paper 2, Q3(b)(ii) (1 mark): Name a practical technique that the student could use to check the purity of a recrystallised product. [1]
June 2023, AS Paper 2, Q3(d)(i) (1 mark): When C6H5CH2CH2OH is oxidised with acidified potassium dichromate(VI), an aldehyde and a carboxylic acid are formed. Name the practical technique that should be
June 2023, AS Paper 2, Q3(d)(iii) (1 mark): Give the structural formula of the ester formed when C6H5CH2CH2OH reacts with ethanoic acid. [1]
June 2023, AS Paper 2, Q3(d)(iv) (3 marks): C6H5CH2CH2OH undergoes a dehydration reaction when heated with concentrated sulfuric acid. However, phenylmethanol, C6H5CH2OH, does not undergo this reaction. •
June 2022, Paper 1, Q11 (1 mark): Which of the following alcohols cannot undergo dehydration? A CH3CH2CH2CH2OH B (CH3)2CHCH2OH C (CH3)3COH D CH3CH(OH)CH2CH3 Your answer [1]
June 2022, Paper 1, Q33(b) (2 marks): A student shakes some 4-HBA with sodium hydroxide solution. A reaction occurs forming a soluble product. Write the equation for the reaction of solid 4-HBA, HOC
June 2022, Paper 1, Q33(c)(i) (1 mark): Describe two things that the student would observe. 1 2 [1]
June 2022, Paper 1, Q33(c)(ii) (1 mark): Write a formula for the organic product that is formed when 4-HBA reacts with aqueous sodium carbonate. [1]
June 2022, Paper 1, Q33(d) (5 marks): The student prepares an impure sample of ethyl paraben by reacting 4-HBA with ethanol. Describe how the student could purify the ethyl paraben. You should make
June 2022, Paper 1, Q35(d) (2 marks): Further reactions are then carried out to convert methylbenzene into 4-aminobenzoic acid. COOH NH2 4-aminobenzoic acid Complete the following equation to show a
June 2022, Paper 1, Q35(e)(i) (1 mark): Give the reagents and conditions that a student could use to bring about the reaction in Step 1. [1]
June 2022, Paper 1, Q35(e)(v) (1 mark): The conversion in Step 3 is brought about by heating 4-nitrobenzoic acid with tin and concentrated hydrochloric acid under reflux. Explain why the heating is ca
June 2022, AS Paper 1, Q9 (1 mark): What is the final stage in the purification of a liquid organic product? A distillation B drying C neutralisation D separation Your answer [1]
June 2022, AS Paper 1, Q14 (1 mark): A compound has the structure shown. CH2OH HOOC What is a correct property of this compound? A It fizzes with NaOH(aq). B It gives a purple colour with neutral i
June 2022, AS Paper 2, Q3(a)(ii) (1 mark): Give the reagents and conditions required for reaction 1. Reagents Conditions [1] 10 Reaction 1 (repeated) CH2CH2OH CH2COOH Reaction 1 Compound A Compound B
June 2022, AS Paper 2, Q3(c) (1 mark): Reaction 3 Compound A can be reacted with hydrochloric acid. An incomplete equation is shown below. CH2CH2OH CH2CH2Cl Reaction 3 Complete the balanced equation
June 2022, AS Paper 2, Q3(d) (6 marks): This question concerns some reactions of compound A. CH2CH2OH Compound A Compound A is found in extract of orange blossom. A group of chemists carry out some re
November 2021, Paper 1, Q15 (1 mark): A compound has the formula C6H5CH2OH. What is a correct reaction of this compound? A dehydration to an alkene B oxidation to a ketone C oxidation to an aldehyde
November 2021, Paper 1, Q16 (1 mark): An organic liquid is contaminated with acid. The liquid is placed in a separating funnel. What is the correct sequence for the operations that follow? separate
November 2021, Paper 1, Q28 (1 mark): Which of the following changes will result in a more sustainable process? 1 Increasing the temperature to get the products as fast as possible. 2 Reducing the n
November 2021, Paper 1, Q30 (1 mark): A substance Z reacts with aqueous sodium carbonate to produce carbon dioxide. Which of the following could be substance Z? O C OH 1 OH OH 2 OH 3 A 1, 2 and 3 B
November 2021, Paper 1, Q34(d) (3 marks): The students’ product, compound C, is a solid. Explain how they could purify this solid by recrystallisation. [3] 26 The first step from part (a) is: R' OC2H5 R
November 2021, Paper 3, Q1(a) (4 marks): Complete the flow diagram by writing on the dotted lines and drawing skeletal formulae in the empty boxes. Silver mirror formed reagent butan-1-ol skeletal form
November 2021, Paper 3, Q1(d) (6 marks): Alcohols are useful intermediates and react to give a variety of products. For example, butan-1-ol can be oxidised to other useful products as shown below. (d)*
November 2021, AS Paper 1, Q4 (1 mark): A chemical company is looking for a new ‘greener’ process. Which feature of the new process, compared with the old one, would the company choose? A It has more
November 2021, AS Paper 1, Q12 (1 mark): What is a correct property of a phenol? A It fizzes with sodium carbonate solution. B It is neutralised by sodium hydroxide. C It reacts with carboxylic acids t
November 2021, AS Paper 1, Q13 (1 mark): Which statement about recrystallisation is correct? A Insoluble impurities remain until the end. B Soluble impurities are filtered off at the start. C The cryst
November 2021, AS Paper 1, Q22(a)(i) (1 mark): Draw the skeletal formula for phenyl ethanoate. [1]
November 2021, AS Paper 1, Q22(b) (1 mark): After some other purification stages, the students end up with phenyl ethanoate (boiling point 196 °C) dissolved in a liquid of boiling point 170 °C. Name the s
November 2021, AS Paper 1, Q24(d) (2 marks): Butan-1-ol reacts with carboxylic acids to form esters in the presence of concentrated sulfuric acid. Complete the equation for the formation of the ester and a
November 2020, Paper 1, Q13 (1 mark): What happens when the compound shown is distilled with acidified potassium dichromate(VI)? OH A No new product is formed. B An aldehyde is formed. C A ketone is
November 2020, Paper 1, Q22 (1 mark): Which esterification reaction is correct? A (CH3CO)2O + C2H5OH CH3COOC2H5 + CH3COOH B (CH3CO)2O + 2CH3OH 2CH3COOCH3 C CH3COOH + C6H5OH CH3COOC6H5 + H2O D CH3COC
November 2020, Paper 1, Q28 (1 mark): A manufacturer is producing a medicine. The manufacturer considers the following ways of improving the process. 1 Raising the temperature to get the product mor
November 2020, Paper 2, Q4(g)(ii) (1 mark): Suggest another reason why the reaction selected in (g)(i) is preferred. [1]
November 2020, Paper 3, Q2(b)(i) (1 mark): adding cyclohexane [1]
November 2020, Paper 3, Q2(b)(ii) (1 mark): adding sodium carbonate solution [1]
November 2020, Paper 3, Q2(b)(iii) (1 mark): standing the cyclohexane layer over solid anhydrous sodium sulfate [1]
November 2020, Paper 3, Q2(b)(iv) (1 mark): collecting the distillate above 190 °C [1]
November 2020, AS Paper 1, Q14 (1 mark): Which statement about the reactions of methanol is correct? A It cannot be oxidised to methanal. B It reacts with acid anhydrides to form methyl esters. C It re
November 2020, AS Paper 1, Q15 (1 mark): Which colour change is correct? A Acidified dichromate(VI) changes from orange to green when reduced. B Alkenes turn bromine from colourless to brown. C Chlorop
November 2020, AS Paper 1, Q16 (1 mark): Which statement about the purification of a solid by recrystallisation is correct? A Insoluble impurities are removed in the last stage of the process. B Solubl
November 2020, AS Paper 2, Q3(a) (3 marks): 4-hydroxybenzoic acid has the following structural formula. O HO C OH 4-hydroxybenzoic acid reacts with both sodium hydroxide and sodium carbonate solutions. Th
November 2020, AS Paper 2, Q3(b)(i) (1 mark): Explain why the heating is carried out under reflux. [1] 10 The reaction from (b) is shown again here. O H3C O HO C + (CH3CO)2O C O C + CH3COOH OH OH O 4-hydrox
November 2020, AS Paper 2, Q3(e) (1 mark): Describe a simple test-tube reaction that would distinguish between 4-hydroxybenzoic acid and 4-acetoxybenzoic acid. [1]
November 2020, AS Paper 2, Q3(f) (4 marks): 4-acetoxybenzoic acid is much more soluble in hot ethanol than cold ethanol. Using this information, describe how to obtain a pure dry sample of 4-acetoxybenzoi
November 2020, AS Paper 2, Q3(g) (6 marks): Parabens are compounds used as preservatives in some cosmetics. A paraben can be made from the reaction between 4-hydroxybenzoic acid and ethanoic anhydride. (g
June 2019, Paper 1, Q4 (1 mark): What is a principle of green chemistry? A Heating a reaction to speed it up B Improving the atom economy of a process C Disposing of waste efficiently D Using o
June 2019, Paper 1, Q13 (1 mark): Which reaction does not occur? A C6H5COOH + NaOH C6H5COONa + H2O B C6H5OH + NaOH C6H5ONa + H2O C 2C6H5COOH + CaCO3 (C6H5COO)2Ca + CO2 + H2O D 2C6H5OH + Na2CO3 2
June 2019, Paper 1, Q35(c) (1 mark): Compound A contains a phenol group. How do the students identify the phenol group? Test Expected result [1]
June 2019, Paper 1, Q35(d)(i) (3 marks): Fill in the table to show the reagents, conditions and colour changes for their tests. Reagent(s) Conditions Colour change Oxidation of alcohol Identification o
June 2019, Paper 1, Q35(e)(ii) (2 marks): The students want to make the ethanoate ester of compound A. Give the equation for a reaction to do this. Use structural formulae for the organic molecules. [2]
June 2019, Paper 1, Q35(f)(i) (2 marks): Complete the reaction sequence by writing on the dotted lines. [2]
June 2019, Paper 1, Q35(f)(ii) (2 marks): Comment on the student’s method of changing the position of the double bond. [2]
June 2019, Paper 3, Q2(c) (3 marks): Fig. 2.2 shows some information found on a bottle of ethanoic anhydride. The students use the information in Fig. 2.2 to write a risk assessment for ethanoic an
June 2019, Paper 3, Q2(e)(i) (3 marks): Name the technique in Fig. 2.4 and explain how this apparatus is used to get a sample of impure solid paracetamol. [3]
June 2019, Paper 3, Q2(e)(ii) (1 mark): Suggest a reason for using the technique in Fig. 2.4 rather than simple filtration. [1] 7 Fig. 2.1 is repeated below. O O O H HO NH2 + C C HO N + C H3C O CH3 HO
June 2019, AS Paper 1, Q18 (1 mark): What is not a reaction of 2-methylpropan-2-ol? A Reaction with an acid anhydride to form an ester B Oxidation to a ketone C Dehydration to an alkene D Reaction
June 2019, AS Paper 1, Q24(b) (2 marks): Suggest laboratory reagents and conditions for converting salicyl alcohol to salicylic acid. Reagents Conditions [2]
June 2019, AS Paper 1, Q24(c)(i) (2 marks): Give the first step in the recrystallisation process. [2]
June 2019, AS Paper 1, Q24(c)(ii) (1 mark): How would the students show that their recrystallised product was purer than the impure sample? [1]
June 2019, AS Paper 1, Q24(d) (3 marks): The students make some predictions about salicyl alcohol. They predict that salicyl alcohol will fizz with sodium carbonate solution. They also predict that sal
June 2019, AS Paper 1, Q24(e)(i) (1 mark): When salicyl alcohol reacts with concentrated hydrochloric acid, only one –OH group reacts. Write the formula of the product formed. [1]
June 2019, AS Paper 1, Q24(e)(ii) (1 mark): Salicyl alcohol reacts with ethanoic acid in the presence of concentrated sulfuric acid. Draw the skeletal formula of the product formed. [1]
June 2018, Paper 1, Q10 (1 mark): The reaction below produces a chloroalkane. R–OH + HCl R–Cl + H2O Which row shows the steps to purify the liquid product in the correct order? Use a separating
June 2018, Paper 1, Q19 (1 mark): Which compound will react with acidified potassium dichromate(VI)? A CH3CH(OH)COOH B (CH3)3COH C CH3COOH D CH3COCH3 Your answer [1]
June 2018, Paper 1, Q25 (1 mark): Which molecule will not be made when water is eliminated from CH3CH2C(CH3)(OH)CH2CH2CH3? A CH3C(CH3)=CHCH2CH2CH3 B CH3CH=C(CH3)CH2CH2CH3 C CH2=C(CH2CH3)CH2CH2CH
June 2018, Paper 1, Q31(e) (1 mark): The alcohol from (d) can be oxidised to a carbonyl compound. Give the reagents and conditions to carry out this oxidation. Reagents Conditions [1]
June 2018, Paper 3, Q4(b)(ii) (1 mark): Suggest and explain the reason for step 13 in the procedure. [1]
June 2018, Paper 3, Q4(b)(iii) (3 marks): Describe the practical procedure used to measure the melting point of an organic solid. You do not need to discuss the type of melting point apparatus you use.
June 2018, Paper 3, Q4(b)(iv) (1 mark): What information can the students get from their melting point? [1]
June 2018, Paper 3, Q4(b)(v) (1 mark): The recrystallisation procedure uses ethanol as the solvent. Give the key properties needed by a solvent to be effective in recrystallisation. [1]
June 2018, Paper 3, Q4(c) (4 marks): The students carry out thin layer chromatography of the phenyl benzoate formed. One student states that this will enable them to assess the purity of their prod
June 2018, AS Paper 1, Q6 (1 mark): A company makes a cleaning product and is looking for a ‘greener’ method of making the product. Which one of the following would the company consider? A Finding
June 2018, AS Paper 1, Q17 (1 mark): Which statement about carboxylic acids is correct? A They can be made by oxidising secondary alcohols. B They react with phenols. C They do not fizz with sodium
June 2018, AS Paper 1, Q21(a) (1 mark): Before the students start the preparation, they test the salicylic acid with iron(III) chloride. What colour would they see? [1]
June 2018, AS Paper 1, Q21(b)(i) (1 mark): Balance the equation by writing the structural formula of the other product on the dotted line. [1]
June 2018, AS Paper 1, Q21(c)(i) (1 mark): State the properties of a suitable solvent for recrystallisation. [1]
June 2018, AS Paper 1, Q21(c)(ii) (1 mark): Name a method for testing the purity of the aspirin formed. [1]
June 2018, AS Paper 1, Q21(e) (1 mark): Some other students make the liquid ester ethyl ethanoate. Name the final stage in their purification of the ester. [1]
June 2018, AS Paper 1, Q21(f) (2 marks): The students also carry out some tests on phenol, C6H5OH. They find that it is not very soluble in water but fully dissolves when sodium hydroxide solution is a
June 2018, AS Paper 2, Q2(g) (6 marks): Bioethanol is a well-known biofuel. Biobutanol is another biofuel and can be used in some combustion engines. Biobutanol can be produced in the UK from sugar be
June 2017, Paper 1, Q17 (1 mark): Which row gives correct statements for both distillation and heating under reflux? Distillation Heating under reflux A collects volatile product collects invola
June 2017, Paper 2, Q2(b)(v) (4 marks): The students purify the product from step 3 by recrystallisation from water. Describe the steps in the recrystallisation of a solid product from water. Indicate
June 2017, Paper 2, Q5(a) (3 marks): The article says that hydroxyl groups in cellulose can be oxidised to aldehydes, ketones and carboxylic acids. The structures below each show part of a cellulos
June 2017, Paper 3, Q1(a) (1 mark): The students crush a sweetener tablet and dissolve it in 1 cm3 of water in a test tube. They add a similar volume of 6.0 mol dm–3 hydrochloric acid and some ant
June 2017, Paper 3, Q3(a) (2 marks): Acidified dichromate solution can be used to distinguish between these two compounds. Only cinnamyl alcohol can be oxidised using acid dichromate. Explain why t
June 2017, Paper 3, Q3(b) (4 marks): The products of the oxidation of cinnamyl alcohol by acid dichromate differ depending on the conditions. Two experiments are shown below. Name, in the appropria
June 2017, AS Paper 1, Q5 (1 mark): For which purpose is distillation used? A to allow a liquid to boil without the loss of vapour B to purify a liquid product C to remove an involatile impurity D
June 2017, AS Paper 1, Q6 (1 mark): What is correct about a ‘green chemistry’ process? A It makes waste products that are easier to separate. B It makes processes cheaper. C It uses organic solven
June 2017, AS Paper 1, Q11 (1 mark): What will react with a phenol? A sodium carbonate B sodium hydroxide C ethanoic acid D acidified potassium dichromate [1] Your answer
June 2017, AS Paper 1, Q12 (1 mark): When are insoluble impurities removed during recrystallisation? A when the hot solution is filtered B as the solution cools C when the crystals are filtered off
June 2017, AS Paper 2, Q2(e)(iv) (1 mark): 1-phenylethanol is reacted with potassium dichromate(VI) in sulfuric acid. Draw the structural formula of the product of this reaction. [1]
June 2016, AS Paper 1, Q16 (1 mark): Propan-1-ol is heated with Al2O3. The organic product is then reacted with bromine. What is the final outcome of these two reactions? A 1-bromopropane B 1-bromo
June 2016, AS Paper 1, Q17 (1 mark): Which pair of compounds will react to form the ester CH3CH2COOCH2CH2CH2CH3? A CH3CH2CH2OH and CH3CH2CH2COOH B CH3CH2CH2OH and (CH3CO)2O C CH3CH2COOH and CH3CH2C
June 2016, AS Paper 1, Q22(c)(iii) (2 marks): There are several alcohols that are structural isomers of alcohol A. Give a laboratory test that would distinguish alcohol A from its isomeric alcohols. [2]
June 2016, AS Paper 2, Q3(a)(i) (1 mark): Complete the equation above by drawing the other product in the box. [1]
June 2016, AS Paper 2, Q3(b) (1 mark): The crude aspirin is filtered off. It is then washed, dried and weighed. Student A tests a small amount of the crude aspirin with neutral iron(III) chloride sol
June 2016, AS Paper 2, Q3(c) (4 marks): Describe the essential steps that the student would carry out in order to purify the aspirin by recrystallisation from ethanol as solvent. [4]
June 2016, AS Paper 2, Q3(d) (1 mark): The melting point of aspirin is 138 –140 °C. How would the melting point of the crude aspirin product compare with that of the recrystallised (purer) aspirin? [
June 2016, AS Paper 2, Q3(f) (6 marks): * Student A investigates the composition of both the crude and recrystallised products using thin-layer chromatography. The student applies separate samples of
June 2016, AS Paper 2, Q3(g) (3 marks): Paracetamol is another widely used painkiller. The structures of paracetamol and aspirin are shown below. H O OH N O O HO O paracetamol aspirin A student adds s
June 2016, AS Paper 2, Q4(a)(i) (1 mark): Give the reagents and the conditions for the laboratory oxidation of ethanol to ethanoic acid. Reagents Conditions [1]
June 2016, AS Paper 2, Q4(a)(ii) (1 mark): Write a balanced equation for the oxidation of ethanol to ethanoic acid. Use structural formulae for the organic compounds and use [O] to represent the oxidisin

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