1
1 mark
Butanoic acid may be prepared by the acid hydrolysis of
butyl ethanoate
1-chlorobutane
ethyl butanoate
propanenitrile
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Organic Chemistry: Carboxylic Acids (Edexcel International A Level (IAL) Chemistry): Exam Questions
Exam code: YCH11
35 mins13 questions
2
1 mark
Compound X, C4H10O, is oxidised to form compound Y.
Compound Y reacts with ethanol in the presence of concentrated sulfuric acid to give an ester, Z.
Which of these could be the formula of Z?
CH3COOC(CH3)3
CH3CH2COO(CH2)3CH3
(CH3)2CHCOOCH2CH3
CH3CH2COOCH2CH(CH3)2
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3
1 mark
Terylene is a polyester derived from ethane-1,2-diol and terephthalic acid.
What is the structure of the repeat unit of terylene?
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4
1 mark
Propyl ethanoate, CH3COOCH2CH2CH3, is hydrolysed with aqueous sodium hydroxide.
Which products are formed?
CH3COOH and CH3CH2CH2OH
CH3COOH and CH3CH2CH2ONa
CH3COONa and CH3CH2CH2OH
CH3COONa and CH3CH2CH2ONa
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5
1 mark
Which of these compounds is a product of the hydrolysis of CH3COOC3H7 by refluxing with aqueous sodium hydroxide?
CH3OH
C3H7OH
C3H7COOH
C3H7COO–Na+
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6
1 mark
The formation of esters and the hydrolysis of esters are reactions that are slow under normal laboratory conditions.
What speeds up these reactions?
|
| Esterification | Hydrolysis |
☐ | A | acids only | acids only |
☐ | B | acids only | acids and bases |
☐ | C | bases only | bases only |
☐ | D | bases only | acids and bases |
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7
1 mark
2.95 g of ethanoic acid is produced from 2.50 g of ethanol.
What is the percentage yield of ethanoic acid?
[Molar masses in g mol−1: ethanoic acid = 60 ethanol = 46]
65.0 %
84.7 %
90.5 %
118 %
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8
1 mark
Ethanoyl chloride (CH3COCl) reacts with ethanol at room temperature.
What is the organic product of this reaction?
ethanoic acid
ethanol
ethoxyethane
ethyl ethanoate
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9
1 mark
The concentration of reactant A was monitored against time during a reaction. The results are shown below.
![Graph showing a linear decrease in concentration [A] in mol dm⁻³ over time t in seconds, from 1.0 at 0s to 0.0 at 100s.](https://cdn.savemyexams.com/cdn-cgi/image/f=auto,width=3840/https://cdn.savemyexams.com/uploads/2026/05/31190-linear-decrease-in-concentration-a-in-mol-dm-cubed-over-time.png)
What is the order of the reaction with respect to A?
First order
Second order
Third order
Zero order
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10
1 mark
The Arrhenius plot of ln k against 1/T for a reaction is shown.
The gradient of the line is −6005 K.
[Gas constant R = 8.31 J K⁻¹ mol⁻¹]
Calculate the activation energy of this reaction.
−49.9 kJ mol⁻¹
49.9 kJ mol⁻¹
722 kJ mol⁻¹
4.99 × 10⁴ kJ mol⁻¹
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1a
1 mark
The substance known as PHBV is a biodegradable polymer formed from 3-hydroxybutanoic acid and 3-hydroxypentanoic acid.
Which of these is the repeat unit of the polymer?
1b
1 mark
What reaction occurs when PHBV biodegrades to its monomers?
condensation
hydrolysis
hydration
hydrogenation
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