11 markeasy
How many isomeric esters, including stereoisomers, can be synthesised from the reaction of methanoic acid with an alcohol of formula C4H10O?
Choose your answer
3
4
5
6
Chemistry — A-Level
Esters — Multiple-Choice Questions (Cambridge International A-Level Chemistry): Exam Questions
Exam code:970112 questions · 12 marks · ≈ 12 min
21 markeasy
The structure of ester E is shown in the diagram below.
E is hydrolysed in the presence of hydrochloric acid.
Which are the products of this hydrolysis?
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CH3CO2H and (CH3)2CHCH2CH2CHO
CH3CO2H and (CH3)2CHCH2CH2OH
CH3COCl and (CH3)2CHCH2CH2OH
CH3CHO and (CH3)2CHCH2CH2OH
31 markeasy
The ester shown is responsible for the odour of bananas.
Which pair of compounds reacts to form this ester?
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41 markmedium
Cetyl palmitate is a waxy solid and has the molecular formula C15H31CO2C16H33.
Which products are formed when cetyl palmitate is heated under reflux with an excess of aqueous sodium hydroxide?
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C15H31CO2Na and C16H33OH
C15H31CO2Na and C16H33ONa
C15H31OH and C16H33CO2Na
C15H31ONa and C16H33CO2Na
51 markmedium
The diagram shows the structure of ethanedioic acid.
Ethanedioic acid reacts with ethanol in the presence of a few drops of concentrated sulfuric acid to form a diester. The molecular formula of the diester is C6H10O4.
What is the structural formula of the diester?
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CH3CH2CO2CO2CH2CH3
CH3CH2OCOCO2CH2CH3
CH3CH2O2CO2CCH2CH3
CH3CO2CH2CH2OCOCH3
61 markmedium
Lactic acid is a naturally occurring molecule.
What is a property of lactic acid?
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It rapidly decolourises aqueous bromine.
Two molecules can react together in strong acid.
It reduces Fehling’s reagent.
It is insoluble in water.
71 markmedium
How many ester compounds have the molecular formula C4H8O2?
Choose your answer
2
3
4
5
81 markmedium
Compound Q has the formula CH3CH2CO2CH3.
Which row correctly shows the name of compound Q and how its boiling point compares with that of butanoic acid?
| Name of Q | Boiling point compared to butanoic acid | |
|---|---|---|
| A | Methyl propanoate | Lower |
| B | Propyl methanoate | Lower |
| C | Methyl propanoate | Higher |
| D | Propyl methanoate | Higher |
Choose your answer
91 markhard
In the presence of an H+ catalyst, compound X reacts with ethanoic acid to produce the compound below.
What is the molecular formula of compound X?
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C4H8O
C4H8O2
C2H6O2
C2H6O3
101 markhard
During a lesson, a teacher heated ethyl propanoate under reflux with aqueous sodium hydroxide. The mixture was then acidified, and the two organic products are then separated, purified and weighed.
Out of the total mass of products obtained, what is the percentage by mass of each product?
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50.0 % and 50.0 %
57.7 % and 42.3 %
61.7 % and 38.3 %
67.6 % and 32.4 %
111 markhard
30 g of an alcohol and 30 g of a carboxylic acid are heated under reflux together to produce 33.2 g of propyl butanoate.
What is the yield of the ester?
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25 %
38 %
50 %
75 %
121 markhard
Which statement correctly describes the hydrolysis of an ester?
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Heating an ester with dilute acid under reflux produces a sodium carboxylate and an alcohol
Heating an ester with dilute alkali under reflux produces a carboxylic acid and an alcohol
Heating an ester with dilute acid under reflux produces a carboxylic acid and an alcohol in a reversible reaction.
Heating an ester with dilute alkali under reflux produces a carboxylic acid and an alcohol in a reversible reaction.