Q1. Which one of the following is not a correct general formula for the non-cyclic compounds listed?

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1 C Step 4 : concentrated H SO 4 (Total 1 mark) Q1. Which one of the following is not a correct general formula for the non-cyclic compounds listed? A B alcohols C n H n+ O aldehydes C n H n+1 O C esters C n H n O C primary amines C n H n+3 N (Total 1 mark) Q. For this question refer to the reaction scheme below. Which one of the following reagents would not bring about the reaction indicated? A Step 1 : alcoholic KOH B Step : aqueous Br C Step 3 : aqueous NaOH Q3. Ethene is an important starting point for the manufacture of plastics and pharmaceutical chemicals. Most of the ethene used by industry is produced by the thermal cracking of ethane obtained from North Sea gas (Reaction 1). It is also possible to make ethene either from chloroethane (Reaction ) or from ethanol (Reaction 3). (a) Give essential conditions and reagents for each of Reactions and 3. (4) Page 1 of 37

2 (b) Name and outline a mechanism for Reaction. Suggest a reason why chloroethane is not chosen by industry as a starting material to make ethene commercially. (5) (c) Name and outline a mechanism for Reaction 3. Suggest why this route to ethene may become used more commonly in the future as supplies of North Sea gas begin to run out. (6) (Total 15 marks) Q4. For this question refer to the reaction scheme below. Which one of the following statements is not correct? A B C Reaction of W with sodium cyanide followed by hydrolysis of the resulting product gives propanoic acid. Mild oxidation of Z produces a compound that reacts with Tollens reagent, forming a silver mirror. Z reacts with ethanoic acid to produce the ester propyl ethanoate. C W undergoes addition polymerisation to form poly(propene). (Total 1 mark) Page of 37

3 Q5. Glucose, produced during photosynthesis in green plants, is a renewable source from which ethanol can be made. Ethanol is a liquid fuel used as a substitute for petrol. The processes involved can be summarised as follows. Process 1 Process Process 3 Photosynthesis in green plants 6CO + 6H O C 6 H 1 O 6 + 6O Fermentation of glucose to form ethanol Complete combustion of ethanol 3 OH + 3O CO + 3H O (a) State three essential conditions for the fermentation of aqueous glucose in Process. Write an equation for the reaction that takes place during this fermentation. (4) (b) It has been claimed that there is no net carbon (greenhouse gas) emission to the atmosphere when ethanol made by Process is used as a fuel. State the term that is used to describe fuels of this type. Use the equations for Processes 1, and 3 to show why it can be claimed that there is no net emission of carbon-containing greenhouse gases. (3) Page 3 of 37

4 (c) Use the information from the equation for Process 3 above and the mean bond enthalpies from the table below to calculate a value for the enthalpy change for this process. C H C C C O O H C=O O=O Mean bond enthalpy / kj mol Give one reason why the value calculated from mean bond enthalpies is different from the value given in a data book. (4) (d) A student carried out a simple laboratory experiment to measure the enthalpy change for Process 3. The student showed that the temperature of 00 g of water increased by 8.0 C when 0.46 g of pure ethanol was burned in air and the heat produced was used to warm the water. Use these results to calculate the value, in kj mol 1, obtained by the student for this enthalpy change. (The specific heat capacity of water is 4.18 J K 1 g 1 ) Give one reason, other than heat loss, why the value obtained from the student s results is less exothermic than a data book value. (4) (Total 15 marks) Page 4 of 37

5 Q6. Which one of the following reactions will produce an organic compound that has optical isomers? A dehydration of butan--ol by heating with concentrated sulphuric acid B reduction of pentan-3-one by warming with NaBH 4 C D addition of Br to 3-bromopropene reduction of,3-dimethylpent--ene with H in the presence of a nickel catalyst (Total 1 mark) Q7. Ethanal is prepared by heating ethanol with potassium dichromate(vi) in the presence of sulfuric acid. Figures 1 and show two possible ways of heating this reaction mixture. Figure 1 Figure State which arrangement would not be suitable for the preparation of ethanal. Explain your answer. Arrangement... Explanation... (Total marks) Page 5 of 37

6 Q8. Consider the following reaction schemes involving two alcohols, A and B, which are position isomers of each other. 3 OH 3 O 3 COOH A butanal butanoic acid 3 (OH) 3 3 CO 3 B C (a) State what is meant by the term position isomers. () (b) Name compound A and compound C. Compound A... Compound C... () (c) Each of the reactions shown in the schemes above is of the same type and uses the same combination of reagents. (i) State the type of reaction. (ii) Identify a suitable combination of reagents. (iii) State how you would ensure that compound A is converted into butanoic acid rather than into butanal. (iv) Draw the structure of an isomer of compound A which does not react with this combination of reagents. Page 6 of 37

7 (v) Draw the structure of the carboxylic acid formed by the reaction of methanol with this combination of reagents. (6) (d) (i) State a reagent which could be used to distinguish between butanal and compound C. (ii) Draw the structure of another aldehyde which is an isomer of butanal. () (Total 1 marks) Q9. Some alcohols can be oxidised to form aldehydes, which can then be oxidised further to form carboxylic acids. Some alcohols can be oxidised to form ketones, which resist further oxidation. Other alcohols are resistant to oxidation. (a) (b) Draw the structures of the two straight-chain isomeric alcohols with molecular formula, C 4 H 10 O Draw the structures of the oxidation products obtained when the two alcohols from part (a) are oxidised separately by acidified potassium dichromate(vi). Write equations for any reactions which occur, using [O] to represent the oxidising agent. () (6) (c) Draw the structure and give the name of the alcohol with molecular formula C 4 H 10 O which is resistant to oxidation by acidified potassium dichromate(vi). () (Total 10 marks) Page 7 of 37

8 Q10. There are four isomeric alcohols with the molecular formula C 4 H 10 O (a) Two of these are butan-l-ol ( 3 OH) and butan--ol. The other two isomers are alcohol X and alcohol Y. Draw the displayed formula for butan--ol. Alcohol X does not react with acidified potassium dichromate(vi) solution. Give the structure of alcohol X. Name the fourth isomer, alcohol Y. (3) Page 8 of 37

9 (b) The infrared spectrum of one of these isomeric alcohols is given below. Identify one feature of the infrared spectrum which supports the fact that this is an alcohol. You may find it helpful to refer to Table 1 on the Data Sheet. Explain how infrared spectroscopy can be used to identify this isomeric alcohol. (3) (c) British scientists have used bacteria to ferment glucose and produce the biofuel butan-1-ol. Write an equation for the fermentation of glucose (C 6 H 1 O 6 ) to form butan-1-ol, carbon dioxide and water only. State one condition necessary to ensure the complete combustion of a fuel in air. Write an equation for the complete combustion of butan-1-ol and state why it can be described as a biofuel. (4) Page 9 of 37

10 (d) Butan-1-ol reacts with acidified potassium dichromate(vi) solution to produce two organic compounds. State the class of alcohols to which butan-1-ol belongs. Draw the displayed formula for both of the organic products. State the type of reaction that occurs and the change in colour of the potassium dichromate(vi) solution. (5) (Total 15 marks) Q11. Many naturally-occurring organic compounds can be converted into other useful products. (a) Glucose, C 6 H 1 O 6, can be fermented to make ethanol, which can then be dehydrated to make the unsaturated compound, ethane. (i) Write an equation for the fermentation of glucose to form ethanol. (ii) Identify a catalyst for the dehydration of ethanol to form ethene. Write an equation for this reaction. Catalyst... Equation... (3) (b) Vegetable oils, which contain unsaturated compounds, are used to make margarine. Identify a catalyst and a reagent for converting a vegetable oil into margarine. Catalyst... Reagent... () Page 10 of 37

11 (c) Oleic acid can be obtained from vegetable oils. Oleic acid is an example of an unsaturated compound. 3 ( ) 7 =( ) 7 COOH oleic acid (i) Deduce the molecular formula and the empirical formula of oleic acid. Molecular formula... Empirical formula... (ii) State what is meant by the term unsaturated. (iii) Identify a reagent for a simple chemical test to show that oleic acid is unsaturated. State what you would observe when oleic acid reacts with this reagent. Reagent... Observation with oleic acid... (5) (Total 10 marks) Q1. In an investigation of the chemical properties of alcohols, a mixture of ethanol and acidified potassium dichromate(vi) is heated in a conical flask in a water bath. (a) Explain why a water bath is used to heat the mixture. (b) Describe the colour change which would be observed. (Total marks) Q13. Ethanol can be oxidised slowly to ethanal. State how a sample of ethanol could be tested to confirm the presence of ethanal. State what you would observe. Test. Observation... (Total marks) Page 11 of 37

12 Q14. Glucose can decompose in the presence of microorganisms to form a range of products. One of these is a carboxylic acid (M r = 88.0) containing 40.9% carbon and 4.5% hydrogen by mass. (a) Deduce the empirical and molecular formulas of the carboxylic acid formed. Empirical formula =... Molecular formula =... (4) (b) Ethanol is formed by the fermentation of glucose. A student carried out this fermentation reaction in a beaker using an aqueous solution of glucose at a temperature of 5 C in the presence of yeast. Write an equation for the reaction occurring during fermentation. (c) In industry, this fermentation reaction is carried out at 35 C rather than 5 C. Suggest one advantage and one disadvantage for industry of carrying out the fermentation at this higher temperature. Advantage... Disadvantage... () (d) The method used by the student in part (b) would result in the ethanol being contaminated by ethanoic acid. How does this contamination occur? Page 1 of 37

13 (e) Give two differences between the infrared spectrum of a carboxylic acid and that of an alcohol other than in their fingerprint regions. Use Table A on the Data Sheet. Difference 1... Difference... () (Total 10 marks) Q15. Sulfuric acid is an important chemical in many industrial and laboratory reactions. Consider the following three reactions involving sulfuric acid. Reaction 1 Reaction Mg(OH) + H SO 4 MgSO 4 + H O The reaction of solid sodium bromide with concentrated sulfuric acid Reaction 3 H C= + H O 3 OH (a) Give a use for magnesium hydroxide in medicine. (b) Sulfuric acid behaves as an oxidising agent in Reaction. (i) In terms of electrons, state the meaning of the term oxidising agent. (ii) Give the formula of the oxidation product that is formed from sodium bromide in Reaction. (iii) Deduce the half-equation for the reduction of H SO 4 to SO in Reaction. Page 13 of 37

14 (c) The formation of ethanol in Reaction 3 uses concentrated sulfuric acid and proceeds in two stages according to the following equations. Stage 1 H C= + H SO 4 3 OSO OH Stage 3 OSO OH + H O 3 OH + H SO 4 (i) State the overall role of sulfuric acid in Reaction 3. (ii) Outline a mechanism for Stage 1 of this reaction. (4) (iii) State the class of alcohols to which ethanol belongs. (iv) Draw the displayed formula of the carboxylic acid formed when ethanol is oxidised by an excess of acidified potassium dichromate(vi) solution. (Total 11 marks) Page 14 of 37

15 Q16. A student devised an experiment to investigate the enthalpies of combustion of some alcohols. The student chose the following series of primary alcohols. Name Formula Methanol Ethanol Propan-1-ol Butan-1-ol Pentan-1-ol Alcohol X Heptan-1-ol 3 OH 3 OH 3 OH 3 OH 3 OH 3 OH 3 OH (a) (i) Name alcohol X. (ii) State the general name of the type of series shown by these primary alcohols. (iii) Draw the displayed formula of the position isomer of butan-1-ol. (iv) Using [O] to represent the oxidising agent, write an equation for the oxidation of butan-1-ol to form an aldehyde. (v) Draw the displayed formula of a functional group isomer of this aldehyde. Page 15 of 37

16 (b) The student carried out a laboratory experiment to determine the enthalpy change when a sample of butan-1-ol was burned. The student found that the temperature of 175 g of water increased by 8.0 C when mol of pure butan-1-ol was burned in air and the heat produced was used to warm the water. Use the student s results to calculate a value, in kj mol 1, for the enthalpy change when one mole of butan-1-ol is burned. (The specific heat capacity of water is 4.18 J K 1 g 1 ) (3) (c) (i) Give the meaning of the term standard enthalpy of combustion. (3) Page 16 of 37

17 (ii) Use the standard enthalpy of formation data from the table and the equation for the combustion of butan-1-ol to calculate a value for the standard enthalpy of combustion of butan-1-ol. 3 OH(l) O (g) CO (g) H O(l) ΔH f ο / kj mol OH(l) + 6O (g) 4CO (g) + 5H O(l) (3) Page 17 of 37

18 (d) The student repeated the experiment described in part (b) and obtained an experimental value for the enthalpy of combustion for each alcohol in this series. These experimental values were then compared with calculated values from standard enthalpies of formation, as shown in the graph below. (i) In terms of bonds broken and bonds formed, explain why the calculated values of enthalpies of combustion of these alcohols, when plotted against M r, follow a straight line. () (ii) Give two reasons why the experimental values obtained by the student are lower than the calculated values using the enthalpy of formation data. () (Total 18 marks) Q17. (a) Propanoic acid can be made from propan-1-ol by oxidation using acidified potassium dichromate(vi). Propanal is formed as an intermediate during this oxidation. (i) State the colour of the chromium species after the potassium dichromate(vi) has reacted... Page 18 of 37

19 (ii) Describe the experimental conditions and the practical method used to ensure that the acid is obtained in a high yield. Draw a diagram of the assembled apparatus you would use. Conditions..... Apparatus (4) (iii) Describe the different experimental conditions necessary to produce propanal in high yield rather than propanoic acid..... () (b) Propan-1-ol is a volatile, flammable liquid. Give one safety precaution that should be used during the reaction to minimise this hazard. (c) A student followed the progress of the oxidation of propan-1-ol to propanoic acid by extracting the organic compounds from one sample of reaction mixture. (i) Give a chemical reagent which would enable the student to confirm the presence of propanal in the extracted compounds. State what you would observe when propanal reacts with this reagent. Reagent... Observation () Page 19 of 37

20 (ii) Give a chemical reagent that would enable the student to confirm the presence of propanoic acid in the extracted compounds. State what you would observe when propanoic acid reacts with this reagent. Reagent... Observation () (d) Predict which one of the compounds, propan-1-ol, propanal and propanoic acid will have the highest boiling point. Explain your answer. Prediction... Explanation... (3) (Total 15 marks) Q18. The following instructions are from an experimental procedure for the preparation of cyclohexene from cyclohexanol and concentrated phosphoric acid. Read these instructions and answer the questions that follow. 1 Place 5 cm 3 of cyclohexanol into a round-bottomed flask with some porous pot to act as anti-bumping granules. Add 10 cm 3 of concentrated phosphoric acid carefully while shaking the flask. Cool the flask under the tap if it gets too hot. Make sure the reagents are thoroughly mixed. Set up an apparatus for simple distillation using this flask. 3 Warm the flask, gently at first, for about 15 minutes. Then increase the heating so that cyclohexene begins to distil over. Collect the fraction that distils below 95 C. (a) State the purpose of the anti-bumping granules. Page 0 of 37

21 (b) Name the part of the distillation apparatus where cyclohexene vapour is changed back into a liquid. Draw a simple diagram of this part of the apparatus. Name Diagram () (Total 3 marks) Q19. Some alcohols can be oxidised by an acidified solution of potassium dichromate(vl). Aldehydes can be oxidised by Tollens reagent or by Fehling s solution. An unknown pure liquid A contains only a single alcohol. Outline a simple procedure to allow you to determine whether A is a primary, a secondary or a tertiary alcohol (Total 3 marks) Page 1 of 37

22 Q0. Glucose is an organic molecule. Glucose can exist in different forms in aqueous solution. (a) In aqueous solution, some glucose molecules have the following structure. (i) Deduce the empirical formula of glucose... (ii) Consider the infrared spectrum of solid glucose. Wavenumber / cm 1 State why it is possible to suggest that in the solid state very few molecules have the structure shown. You may find it helpful to refer to Table 1 on the Data Sheet..... (b) In the absence of oxygen, an aqueous solution of glucose can be fermented to produce ethanol for use in alcoholic drinks. Write an equation for this fermentation reaction. Give two other essential conditions for the production of ethanol in this fermentation. Equation Condition 1... Condition... (3) Page of 37

23 (c) Any ethanol present in the breath of a drinker can be detected by using a breathalyser. The ethanol is converted into ethanoic acid. The breathalyser has negative and positive electrodes. A current is measured and displayed in terms of alcohol content. The overall redox equation is as follows 3 OH(I) + O (g) 3 COOH(I) + H O(I) (i) Draw the displayed formula for ethanoic acid. (ii) Deduce a half-equation for the reduction of atmospheric oxygen to water in acidic solution at one electrode of the breathalyser... (iii) Deduce a half-equation for the oxidation of ethanol in water to ethanoic acid at the other electrode of the breathalyser... (iv) The earliest breathalysers used laboratory chemicals to oxidise the ethanol to ethanoic acid. Detection was by a colour change. Identify a reagent or combination of reagents that you would use in the laboratory to oxidise ethanol to ethanoic acid. State the colour change that you would expect to see. Reagent or combination of reagents... Colour change... () Page 3 of 37

24 (d) The fermentation of glucose from crops is the main method for the production of ethanol. The product is called bioethanol. The European Union has declared that bioethanol is carbon-neutral. (i) State the meaning of the term carbon-neutral (Extra space)..... (ii) Other than carbon-neutrality, state the main advantage of the use of glucose from crops as the raw material for the production of ethanol..... (iii) Give one disadvantage of the use of crops for the production of ethanol..... (Total 13 marks) Q1. The reaction of butane-1,4-diol with butanedioic acid produces the polymer PBS used in biodegradable packaging and disposable cutlery. Butanedioic acid is produced by two different processes. Process 1 Aqueous sodium hydroxide reacts with 1,4-dibromobutane to make butane-1,4-diol. Butane-1,4-diol is oxidised to butanedioic acid. Process Glucose reacts with carbon dioxide in the presence of microorganisms to produce butanedioic acid directly. The carbon dioxide used in this process is obtained from a local factory that produces bioethanol. Page 4 of 37

25 (a) Deduce one safety reason and one environmental reason why Process is preferred to Process 1. (Extra space)... () (b) (i) Name and outline a mechanism for the following reaction that occurs in Process 1. Br Br + NaOH Br OH + NaBr.. (3) (ii) The infrared spectra shown are those of three compounds. Compound A 1,4-dibromobutane Compound B butane-1,4-diol Compound C butanedioic acid Identify the compound responsible for each spectrum by writing the correct letter, A, B or C, in the box next to each spectrum. You may find it helpful to refer to Table 1 on the Data Sheet. Page 5 of 37

26 (3) (c) In the production of bioethanol, glucose (C 6 H 1 O 6 ) is converted into a dilute aqueous solution of ethanol and carbon dioxide. Give the name of this process and state three essential conditions necessary to produce a good yield of ethanol. (Extra space)... (4) Page 6 of 37

27 (d) State the class of alcohols to which the diol butane-1,4-diol belongs. Identify a suitable reagent or combination of reagents for the conversion of butane-1,4-diol into butanedioic acid (HOOC COOH). Write an equation for this oxidation reaction using [O] to represent the oxidising agent. (Extra space)... (3) (Total 15 marks) Q. A sample of -methylpropan--ol was contaminated with butan--ol. The student separated the two alcohols using chromatography. Identify a reagent or combination of reagents that the student could use to distinguish between these alcohols. State what would be observed for each alcohol. Reagent(s). Observation with -methylpropan--ol Observation with butan--ol (Total 3 marks) Page 7 of 37

28 Q3. This question concerns the oxidation of a primary alcohol. The experiment was carried out using the distillation apparatus shown in the diagram. The oxidation product was distilled off as soon as it was formed. (a) Suggest the identity of reagent P. (b) State the chemical change that causes the solution in the flask to appear green at the end of the reaction. (c) Give one reason why using a water bath is better than direct heating with a Bunsen burner. (d) Suggest a reagent that could be used to confirm the presence of an aldehyde in the distillate. State the observation you would expect to make if an aldehyde were present. Reagent... Observation... () (Total 5 marks) Page 8 of 37

29 Q4. (a) Propanone can be formed when glucose comes into contact with bacteria in the absence of air. (i) Balance the following equation for this reaction of glucose to form propanone, carbon dioxide and water....c 6 H 1 O CO CO +...H O (ii) Deduce the role of the bacteria in this reaction... (b) Propanone is also formed by the oxidation of propan ol. (i) Write an equation for this reaction using [O] to represent the oxidising agent... (ii) State the class of alcohols to which propan ol belongs... (c) A student determined a value for the enthalpy change when a sample of propanone was burned. The heat produced was used to warm some water in a copper calorimeter. The student found that the temperature of 150 g of water increased by 8.0 C when mol of pure propanone was burned in air. Use the student s results to calculate a value, in kj mol 1, for the enthalpy change when one mole of propanone is burned. (The specific heat capacity of water is 4.18 J K 1 g 1 ) (3) Page 9 of 37

30 (d) Define the term standard enthalpy of combustion. (3) (e) Use the mean bond enthalpy data in the table and the equation given below the table to calculate a value for the standard enthalpy change when gaseous propanone is burned. C H C C C O O H C=O O=O Mean bond enthalpy / kj mol CO 3 (g) + 4O (g) 3CO (g) + 3H O(g) (3) (f) Suggest two reasons why the value obtained by the student in part (c) is different from the value calculated in part (e). Reason 1... Reason... () (Total 15 marks) Page 30 of 37

31 Q5. Propane-1,-diol has the structure (OH)(OH) 3. It is used to make polyesters and is one of the main substances in electronic cigarettes (E-cigarettes). A sample of propane-1,-diol was refluxed with a large excess of potassium dichromate(vi) and sulfuric acid. (a) Draw the skeletal formula of propane-1,-diol. (b) Write an equation for this oxidation reaction of propane-1,-diol under reflux, using [O] to represent the oxidizing agent. Show the displayed formula of the organic product.... () (c) Draw a labelled diagram to show how you would set up apparatus for refluxing. () (d) Anti-bumping granules are placed in the flask when refluxing. Suggest why these granules prevent bumping Page 31 of 37

32 (e) Draw the structure of a different organic product formed when the acidified potassium dichromate(vi) is not in excess. (Total 7 marks) Q6. Propene can be made by the dehydration of propan--ol. What is the percentage yield when 30 g of propene (M r = 4.0) are formed from 50 g of propan--ol (M r = 60.0)? A 60% B 67% C 81% D 86% (Total 1 mark) Page 3 of 37

33 Q7. Ethanol can be oxidised by acidified potassium dichromate(vi) to ethanoic acid in a twostep process. ethanol ethanal ethanoic acid (a) In order to ensure that the oxidation to ethanoic acid is complete, the reaction is carried out under reflux. Describe what happens when a reaction mixture is refluxed and why it is necessary, in this case, for complete oxidation to ethanoic acid. (3) (b) Write a half-equation for the overall oxidation of ethanol into ethanoic acid. Page 33 of 37

34 (c) The boiling points of the organic compounds in a reaction mixture are shown in the following table. Compound ethanol ethanal ethanoic acid Boiling point / C Use these data to describe how you would obtain a sample of ethanal from a mixture of these three compounds. Include in your answer a description of the apparatus you would use and how you would minimise the loss of ethanal. Your description of the apparatus can be either a description in words or a labelled sketch. (5) (d) Use your knowledge of structure and bonding to explain why it is possible to separate ethanal in this way. () Page 34 of 37

35 (e) A student obtained a sample of a liquid using the apparatus in part (c). Describe how the student could use chemical tests to confirm that the liquid contained ethanal and did not contain ethanoic acid. (5) (Total 16 marks) Q8. Alcohol A ( 3 ) (OH) 3 undergoes reactions separately with acidified potassium dichromate(vi) and with concentrated sulfuric acid. (a) Deduce the IUPAC name for alcohol A. (b) Draw the structure of the organic product, B, formed when A is oxidised in the reaction with acidified potassium dichromate(vi). (c) Two isomeric alkenes, C and D, are formed when A is dehydrated in the reaction with concentrated sulfuric acid. Name the mechanism for this dehydration reaction. Page 35 of 37

36 (d) Draw the structure of each isomer. Isomer C Isomer D () (e) Name the type of structural isomerism shown by C and D. (f) List alcohol A, product B and isomer C in order of increasing boiling point. (g) Draw the structure of the isomer of A that is not oxidised by acidified potassium dichromate(vi). (h) Draw the structure of the isomer of A that cannot be dehydrated to form an alkene by reaction with concentrated sulfuric acid. (Total 9 marks) Page 36 of 37

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Alcohols. Ethanol Production. 182 minutes. 181 marks. Page 1 of 25

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