OCR A-Level Chemistry Synthesis and analytical techniques (02), June 2025
Every question from OCR A-Level Chemistry Synthesis and analytical techniques (02), June 2025 (H432): 23 questions, 100 marks, each with its mark scheme and topic.
- Question 1 1 mark
Identify which given organic compound is both alicyclic and unsaturated.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 2 1 mark
Calculate the mass of bromine required to react completely with 0.0200 mol of a diene to form a saturated compound.
Module 4: Core organic chemistry · Module 2: Foundations in chemistry · 4.1 Basic concepts and hydrocarbons · 2.1 Atoms and reactions
- Question 3 1 mark
Determine the number of hydrogen atoms in the molecular formula of the given medicinal drug from its skeletal structure.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 4 1 mark
Identify the correct apparatus setup for heating under reflux to convert ethanol to ethanoic acid.
Module 4: Core organic chemistry · Module 1: Development of practical skills in chemistry · Practical Activity Groups · 4.2 Alcohols, haloalkanes and analysis · 1.1 Practical skills assessed in a written examination · 1.2 Practical skills assessed in the practical endorsement · PAG 5: Synthesis of an organic liquid
- Question 5 1 mark
Calculate the number of water molecules formed when 0.200 mol of butanedioic acid reacts with 0.300 mol of sodium hydroxide.
Module 2: Foundations in chemistry · Module 6: Organic chemistry and analysis · 2.1 Atoms and reactions · 6.1 Aromatic compounds, carbonyls and acids
- Question 6 1 mark
Identify which reaction producing propene has the lowest atom economy.
Module 2: Foundations in chemistry · Module 4: Core organic chemistry · 2.1 Atoms and reactions · 4.1 Basic concepts and hydrocarbons
- Question 7 1 mark
Identify the organic products formed from the acid hydrolysis of N-methylpropanamide.
Module 6: Organic chemistry and analysis · 6.2 Nitrogen compounds, polymers and synthesis
- Question 8 1 mark
Identify the correct statement regarding the role of hydrogen bromide in its reaction with ethene.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 9 1 mark
Identify which reagents can be used to prepare phenyl propanoate.
Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids
- Question 10 1 mark
Determine the number of stereoisomers for the compound CH3CH(Br)CH=CHCH(Cl)CH3.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.1 Basic concepts and hydrocarbons · 6.2 Nitrogen compounds, polymers and synthesis
- Question 11 1 mark
Identify which molecule does not produce a mass spectrum containing a fragment peak at m/z = 29.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.2 Alcohols, haloalkanes and analysis · 6.3 Analysis
- Question 12 1 mark
Identify which process does not involve infrared radiation from a list of environmental and analytical processes.
Module 4: Core organic chemistry · 4.2 Alcohols, haloalkanes and analysis
- Question 13 1 mark
Identify which of the given organic molecules would form a ketone group upon oxidation.
Module 4: Core organic chemistry · 4.2 Alcohols, haloalkanes and analysis
- Question 14 1 mark
Identify which reagents react with vitamin C based on its functional groups.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons · 4.2 Alcohols, haloalkanes and analysis
- Question 15 1 mark
Determine which of the given organic compounds has/have three peaks in their 13C NMR spectrum.
Module 6: Organic chemistry and analysis · 6.3 Analysis
- Question 16 12 marks
Name an alkene, determine molecular formulae and bond counts, draw and explain E/Z stereoisomers, construct an incomplete combustion equation, and complete an alkene addition reaction flowchart.
Module 4: Core organic chemistry · Module 2: Foundations in chemistry · 4.1 Basic concepts and hydrocarbons · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure
- Question 17 6 marks
Plan a two-stage synthesis of 4-hydroxypentan-2-one from 4-chloropentan-2-ol, calculating the required mass of starting material given an overall percentage yield of 31.5%, and providing reagents and balanced equations for each step.
Module 2: Foundations in chemistry · Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 2.1 Atoms and reactions · 4.2 Alcohols, haloalkanes and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis
- Question 18 8 marks
Draw two repeat units and identify the polymerisation types for 1-chlorobut-2-ene and 3-hydroxybutanoic acid, explain disposal and hydrolysis properties, and predict products of reaction with ethanoic anhydride.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.1 Basic concepts and hydrocarbons · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis
- Question 19 9 marks
Outline the nucleophilic substitution mechanism of 2-bromopropane with cyanide ions, state the reagents to convert propan-1-ol to 1-bromopropane, and describe the purification of the organic liquid.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · Module 1: Development of practical skills in chemistry · Practical Activity Groups · 4.2 Alcohols, haloalkanes and analysis · 6.2 Nitrogen compounds, polymers and synthesis · 1.1 Practical skills assessed in a written examination · 1.2 Practical skills assessed in the practical endorsement · PAG 5: Synthesis of an organic liquid
- Question 20 17 marks
Explain the evidence for benzene's delocalised model, compare the reactivities of benzene and phenol, and outline the synthesis, mechanism, directing effects, and reduction of substituted aromatic compounds.
Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis
- Question 21 17 marks
Identify functional groups, reagents, and observations for carbonyl compounds, outline the mechanism for nucleophilic addition with NaBH4, and complete an organic reaction flowchart for pyruvic acid.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · Practical Activity Groups · 4.1 Basic concepts and hydrocarbons · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 6.3 Analysis · PAG 7: Qualitative analysis of organic functional groups
- Question 22 6 marks
Use TLC chromatogram data to determine Rf values and identify amino acids in a dipeptide, deduce dipeptide structures, and predict the products and functional group positioning of beta-keto acid decarboxylation.
Module 1: Development of practical skills in chemistry · Module 6: Organic chemistry and analysis · 1.1 Practical skills assessed in a written examination · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 6.3 Analysis
- Question 23 10 marks
Deduce the structures of organic compounds K, L, M, and N using infrared, mass, and NMR spectroscopy, alongside elemental analysis data.
Module 6: Organic chemistry and analysis · Module 4: Core organic chemistry · Module 2: Foundations in chemistry · 6.3 Analysis · 6.1 Aromatic compounds, carbonyls and acids · 4.2 Alcohols, haloalkanes and analysis · 2.1 Atoms and reactions