Carboxylic acids — Paper 1 · A Level Chemistry 9701

23 Y and Z are two widely-used selective weed killers. OCH2CO2H OCH2CH2OH CH3 Cl Cl Cl Y Z Which reagent will distinguish Y from Z? A acidified AgNO3(aq) B Fehling’s solution C Na D Na2CO3(aq)

1 marks

Answer: D

This question in 9701/11 Oct/Nov 2011

28 An unpleasant smelling chemical produced in the human armpit is 3-methylhex-2-enoic acid. CH3 CH3 CH2 CH2 C CH C OH O If this compound is reacted with a cold, dilute, acidified solution of potassium manganate(VII), how many chiral centres will be produced? A 0 B 1 C 2 D 3

1 marks

Answer: C

This question in 9701/11 Oct/Nov 2011

38 On acid hydrolysis, which compounds produce propanoic acid? 1 CH3CH2CO2CH3 2 CH3CH2CH2CN 3 CH3CH2CH2Cl

1 marks

Answer: D

This question in 9701/13 Oct/Nov 2011

38 An organic compound, X, will react with calcium metal to produce a salt with the empirical formula CaC4H4O4. What could be the identity of X? 1 ethanoic acid 2 butanedioic acid 3 2-methylpropanedioic acid

1 marks

Answer: C

This question in 9701/11 May/June 2015

28 How many of the following compounds produce a carboxylic acid on heating under reflux with an excess of hot acidified K2Cr2O7? CH3CH2CHO CH3COCH3 CH3CH2CH2OH CH3CH(OH)CH3 A 1 B 2 C 3 D 4

1 marks

Answer: B

This question in 9701/12 May/June 2016

30 Compound X, C4H8O2, has an unbranched carbon chain. An aqueous solution of X has an approximate pH of 3. Compound Y, C3H8O, is a secondary alcohol. X and Y are reacted together in the presence of a little concentrated sulfuric acid to form Z as the major organic product. What is the structural formula of Z? A (CH3)2CHCO2CH2CH2CH3 B CH3(CH2)2CO2CH(CH3)2 C CH3(CH2)2CO2(CH2)2CH3 D (CH3)2CHCO2CH(CH3)2

1 marks

Answer: B

This question in 9701/12 May/June 2016

28 Chlorogenic acid is found in green coffee beans and is used in treatments for weight loss. HO CO2H O R = C6H5O2 and takes no part in the reaction with sodium carbonate. HO O R OH chlorogenic acid What is produced in good yield when chlorogenic acid is treated with an excess of sodium carbonate solution at room temperature? A B HO CO2Na NaO CO2Na O O HO O R NaO O R OH ONa C D NaO CO2H HO CO2Na O O + NaO O R HO OH HO R ONa OH

1 marks

Answer: A

This question in 9701/13 May/June 2017

29 Alcohols, aldehydes and nitriles can each be converted into carboxylic acids. Which descriptions of their conversions into carboxylic acids are correct? alcohols aldehydes nitriles A hydrolysis hydrolysis hydrolysis B hydrolysis hydrolysis oxidation C oxidation oxidation hydrolysis D oxidation oxidation oxidation

1 marks

Answer: C

This question in 9701/12 Feb/March 2018

39 An unknown organic compound Z reacts with sodium to give a combustible gas as one product. Z does not give a yellow precipitate with alkaline aqueous iodine. What is a possible identity of Z? 1 ethanoic acid 2 pentan-3-ol 3 propan-1-ol

1 marks

Answer: A

This question in 9701/13 May/June 2019

29 Compound Z is shown. compound Z HO CO2H O HO O OH What is produced in good yield when compound Z is treated with an excess of sodium carbonate solution at room temperature? A B HO CO2Na NaO CO2Na O O HO O NaO O OH ONa C D NaO CO2H HO CO2Na O O + NaO O HO OH HO ONa OH

1 marks

Answer: A

This question in 9701/12 Oct/Nov 2020

40 Which reactions produce pentanoic acid? 1 CH3CH2CH2CH(OH)CH3 + H+ / MnO4 –(aq) 2 CH3OCO(CH2)3CH3 + HCl (aq) 3 CH3(CH2)3CN + H2SO4(aq)

1 marks

Answer: C

This question in 9701/12 Oct/Nov 2020

37 The structure of compound R is shown. compound R O OH O Which statements about compound R are correct? 1 It has an Mr of 116. 2 It contains two groups that show strong absorptions between 1640 and 1740 cm–1 in its infrared spectrum. 3 Its only infrared absorption between 2500 and 3000 cm–1 is sharp and strong.

1 marks

Answer: B

This question in 9701/13 Oct/Nov 2020

38 Which compound can be used to make propanoic acid by treatment with a single reagent? A CH2=CHCH2CH3 B CH3CH2CH2CN C CH3CH(OH)CN D CH3CH(OH)CH3

1 marks

Answer: A

This question in 9701/13 May/June 2022

38 Which compounds can be used to make Y in a single-step reaction? Y O OH 1 propanenitrile 2 ethanenitrile 3 propyl ethanoate 4 ethyl propanoate A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: B

This question in 9701/11 Oct/Nov 2022

32 Tartaric acid, HOOCCH(OH)CH(OH)COOH, is found in many plants. A sample of tartaric acid reacts with an excess of LiAlH4 to form the organic product J. What happens when NaOH(aq) is added to separate samples of tartaric acid and J? A Both tartaric acid and J react. B Only tartaric acid reacts. C Only J reacts. D Neither tartaric acid nor J react.

1 marks

Answer: B

This question in 9701/12 Feb/March 2023

37 An aqueous solution contains 4.00g of a carboxylic acid, Q. When this solution reacts with an excess of magnesium, 380cm3 of gas is produced, measured at s.t.p. What is the relative formula mass of Q? A 59 B 118 C 126 D 236

1 marks

Answer: B

This question in 9701/12 Feb/March 2023

27 The structure of butenedioic acid is shown. butenedioic acid OH HO O O When an excess of NaOH(aq) is added to butenedioic acid, which organic product is formed? A OH –O O O D O– –O O O B OH OH HO O O C OH OH OH HO O O

1 marks

Answer: A

This question in 9701/13 May/June 2025