Question 1
1 markWhich reaction produces propanoic acid as one of the organic products?
Cambridge International AS Level · Chemistry (9701)
Carboxylic acids and derivatives: Practice Questions
5 multiple-choice questions marked as you go, and 2 written questions with worked solutions. All on Carboxylic acids and derivatives.
7 questions12 marksFree, no account
Question 2
1 markAn organic compound \(\mathbf{X}\) has the molecular formula \(\text{C}_5\text{H}_{10}\text{O}_2\).
\(\mathbf{X}\) exhibits the following properties:
1. It reacts with aqueous sodium carbonate to produce a gas that turns limewater cloudy.
2. It exists as a pair of non-superimposable mirror images (enantiomers).
Compound \(\mathbf{X}\) is treated with acidified potassium dichromate(\(\text{VI}\)) and heated under reflux, but no colour change is observed.
What is the systematic IUPAC name of compound \(\mathbf{X}\)?
Question 3
1 markA sample of ethanoic acid, \(\text{CH}_3\text{COOH}\), is treated separately with three different reagents: solid magnesium, solid sodium carbonate, and aqueous sodium hydroxide.
Which row correctly identifies the gas evolved in each reaction?
| Magnesium | Sodium carbonate | Aqueous sodium hydroxide | |
|---|---|---|---|
| A | \(\text{H}_2\) | \(\text{CO}_2\) | No gas |
| B | \(\text{CO}_2\) | \(\text{H}_2\) | \(\text{O}_2\) |
| C | \(\text{H}_2\) | \(\text{CO}_2\) | \(\text{H}_2\) |
| D | \(\text{H}_2\) | \(\text{O}_2\) | No gas |
Question 4
1 markA hydroxycarboxylic acid \(\mathbf{Z}\) has the formula \(\text{HO}-\text{CH}_2-\text{CH}_2-\text{COOH}\). Under suitable conditions with an acid catalyst, molecules of \(\mathbf{Z}\) can react with each other via esterification to form a cyclic diester with the formula \(\text{C}_6\text{H}_8\text{O}_4\).
How many atoms form the heterocyclic ring of this cyclic diester?
Question 5
1 markAn organic compound \(\mathbf{X}\) has the molecular formula \(\text{C}_4\text{H}_8\text{O}_2\). When \(\mathbf{X}\) is heated under reflux with dilute sulfuric acid, two organic compounds \(\mathbf{Y}\) and \(\mathbf{Z}\) are formed. Compound \(\mathbf{Y}\) reacts with sodium carbonate to produce carbon dioxide gas. Compound \(\mathbf{Z}\) can be oxidised by acidified potassium dichromate(VI) to produce \(\mathbf{Y}\).
What is the systematic name of compound \(\mathbf{X}\)?
Question 6
4 marksState the reagents and conditions required to hydrolyse ethyl propanoate to produce propanoic acid, and write a balanced equation for this reaction.
Write your answer out first, then check it against the worked solution.
Question 7
3 marksPropanoic acid is a typical carboxylic acid.
(a) Write a balanced chemical equation for the reaction of propanoic acid with sodium carbonate, \(Na_{2}CO_{3}\), including state symbols.
(b) Identify the organic product formed when propanoic acid is reduced by \(LiAlH_{4}\).
(c) Describe how you would test the gas evolved in part (a) to confirm its identity.
Write your answer out first, then check it against the worked solution.
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