O-LevelChemistryOrganic Chemistry5070/22 · May/June 2022 · Q37 Marks
The diagram shows some reactions of butanoic acid. [Figure 3.1: Diagram showing butanoic acid (structure H H H O / H-C-C-C-C-O-H / H H H) reacting with Mg to produce gas A and salt B; reacting with MgCO3 to produce salt B, gas C and liquid D; and reacting with ethanol (heat) to produce liquid D and organic liquid E.]
- (a)A, B, C and D are different substances. Identify by name A, B, C and D. A B C D[4]
- (b)Name and draw the structure of E. name structure[2]
- (c)Butanoic acid is a weak acid. State what is meant by the term weak in weak acid.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [1] A hydrogen
- [1] B magnesium butanoate
- [1] C carbon dioxide
- [1] D water
- [1] ethyl butanoate
- [1] CH3CH2CH2CO2CH2CH3
- [1] does not completely dissociate / partially dissociates
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