OCR A-Level Chemistry Synthesis and analytical techniques (02), June 2023
Every question from OCR A-Level Chemistry Synthesis and analytical techniques (02), June 2023 (H432): 23 questions, 100 marks, each with its mark scheme and topic.
- Question 1 1 mark
Identify which compound is used for proton exchange in NMR spectroscopy among the given multiple-choice options.
Module 6: Organic chemistry and analysis · 6.3 Analysis
- Question 2 1 mark
Identify which compound reacts with 2,4-dinitrophenylhydrazine but does not react with Tollens' reagent among four given options.
Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids
- Question 3 1 mark
Identify the general formula of the alkynes homologous series given propyne as an example.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 4 1 mark
Identify the functional groups present in the structure of paracetamol from a multiple-choice list.
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 5 1 mark
Determine the number of hydrogen atoms in one molecule of oxymetazoline given its chemical structure.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.1 Basic concepts and hydrocarbons · 6.1 Aromatic compounds, carbonyls and acids
- Question 6 1 mark
Identify which statement supports the delocalised model of benzene and not the Kekulé model from a multiple-choice list.
Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids
- Question 7 1 mark
Identify the systematic IUPAC name for the given polyene structure containing multiple double bonds and methyl substituents.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 8 1 mark
Identify the alkane that undergoes complete combustion given the volume of oxygen required at RTP and the moles of the alkane.
Module 2: Foundations in chemistry · Module 4: Core organic chemistry · 2.1 Atoms and reactions · 4.1 Basic concepts and hydrocarbons
- Question 9 1 mark
Identify which compound has the greatest number of peaks in its proton NMR spectrum among the given options.
Module 6: Organic chemistry and analysis · 6.3 Analysis
- Question 10 1 mark
Identify which ester is most likely to produce a mass spectrum with a fragment ion at m/z = 43 from four given structural formulae.
Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.3 Analysis
- Question 11 1 mark
Identify the organic compound that produced the given infrared spectrum from four given structural formulae.
Module 6: Organic chemistry and analysis · Module 4: Core organic chemistry · 6.3 Analysis · 4.2 Alcohols, haloalkanes and analysis
- Question 12 1 mark
Identify which compound reacts with ethanoyl chloride from a given list of four options.
Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis
- Question 13 1 mark
Identify which of the given organic structures are aliphatic compounds from a selection of three numbered structures.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 14 1 mark
Identify which given compound(s) can be hydrolysed by aqueous acid to produce butanoic acid
Module 6: Organic chemistry and analysis · Module 4: Core organic chemistry · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 4.2 Alcohols, haloalkanes and analysis
- Question 15 1 mark
Identify which of the given ions contain bond angles of approximately 120 degrees.
Module 2: Foundations in chemistry · Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 2.2 Electrons, bonding and structure · 4.1 Basic concepts and hydrocarbons · 6.1 Aromatic compounds, carbonyls and acids
- Question 16 15 marks
Explain the trend in boiling points of C6H14 isomers, write radical substitution mechanism steps for 2-methylpentane with bromine, write an equation for per-bromination, and determine the molecular formula of a partially brominated bromoalkane from gas volume and mass data.
Module 2: Foundations in chemistry · Module 4: Core organic chemistry · 2.1 Atoms and reactions · 4.1 Basic concepts and hydrocarbons
- Question 17 14 marks
Construct combustion equations, oxidation reactions, elimination isomer structures, and explain 13C NMR spectra for various alcohols.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.3 Analysis · 4.2 Alcohols, haloalkanes and analysis
- Question 18 11 marks
Outline the nitration mechanism of nitrobenzene to form 1,3-dinitrobenzene, determine its percentage yield, and describe the recrystallization purification method.
Module 6: Organic chemistry and analysis · Practical Activity Groups · 6.1 Aromatic compounds, carbonyls and acids · PAG 6: Synthesis of an organic solid
- Question 19 6 marks
Plan a multi-stage organic synthesis to convert 3-bromopropene into compound Z, identifying reagents, structures of intermediates, and equations.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 6.2 Nitrogen compounds, polymers and synthesis · 4.1 Basic concepts and hydrocarbons · 4.2 Alcohols, haloalkanes and analysis
- Question 20 10 marks
Complete reaction flowcharts for salicylic acid, draw a section of a polymer formed from PAS containing both ester and amide linkages, and calculate the number of PAS molecules in a maximum daily dosage for a child.
Module 6: Organic chemistry and analysis · Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 2.1 Atoms and reactions
- Question 21 9 marks
Explain optical isomerism, name and draw 3D optical isomers of valine, determine the number of optical isomers for a tripeptide, and draw the hydrolysis products of the tripeptide in acid.
Module 6: Organic chemistry and analysis · 6.2 Nitrogen compounds, polymers and synthesis
- Question 22 14 marks
Outline the nucleophilic addition mechanism of acrolein with sodium cyanide in acidic conditions, name the mechanism, and complete a multi-step organic synthesis flowchart involving acrolein.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 4.2 Alcohols, haloalkanes and analysis
- Question 23 6 marks
Identify an unknown organic compound using 2,4-DNP test, elemental analysis, mass spectrometry, IR spectrum, and proton NMR spectrum.
Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.3 Analysis