How many structural isomers have the formula C₅H₁₂?
From Paper 2: Synthesis and analytical techniques
31 mark
What is the general formula of a non-cyclic alkene with one C=C?
From Paper 2: Synthesis and analytical techniques
41 mark
Methane reacts with chlorine in UV light. The type of reaction is:
From Paper 2: Synthesis and analytical techniques
51 mark
Which alcohol is tertiary?
From Paper 2: Synthesis and analytical techniques
61 mark
Which is hydrolysed fastest by water?
From Paper 2: Synthesis and analytical techniques
71 mark
A compound shows a broad absorption at 2500–3300 cm⁻¹ and a sharp one at 1710 cm⁻¹. It is most likely:
From Paper 2: Synthesis and analytical techniques
81 mark
Which species catalyses the breakdown of ozone in the upper atmosphere?
From Paper 2: Synthesis and analytical techniques
16(a)3 marks
Explain why the boiling points of the alkanes increase with chain length, and why branched isomers have lower boiling points.
From Paper 2: Synthesis and analytical techniques
16(b)4 marks
Outline the mechanism for the reaction of methane with bromine in UV light.
From Paper 2: Synthesis and analytical techniques
16(c)4 marks
Propene reacts with HBr. Outline the mechanism and explain why 2-bromopropane is the major product.
From Paper 2: Synthesis and analytical techniques
17(a)3 marks
Propan-1-ol is heated with acidified potassium dichromate(VI). Explain how the apparatus determines which organic product is formed.
From Paper 2: Synthesis and analytical techniques
17(b)3 marks
Outline the mechanism for the reaction of 1-bromopropane with aqueous hydroxide ions.
From Paper 2: Synthesis and analytical techniques
17(c)4 marks
Explain how CFCs deplete the ozone layer. Include equations.
From Paper 2: Synthesis and analytical techniques
18*6 marks
Cyclohexene can be made by heating cyclohexanol with concentrated phosphoric acid. Describe how to prepare and purify a sample of cyclohexene.
From Paper 2: Synthesis and analytical techniques
19(a)5 marks
Compound P contains 62.1% C, 10.3% H and 27.6% O by mass. Its mass spectrum has M⁺ at m/z 58. Its IR spectrum has a strong absorption at 1715 cm⁻¹. It gives an orange precipitate with 2,4-DNP but no reaction with Tollens' reagent. Identify P.
From Paper 2: Synthesis and analytical techniques
23(b)*6 marks
Plan a three-step synthesis of 2-hydroxypropanoic acid from ethanol. Give reagents, conditions and intermediates, and comment on the stereochemistry of the product.
From Paper 3: Unified chemistry
4(a)*6 marks
Three unlabelled bottles contain butan-1-ol, butan-2-ol and 2-methylpropan-2-ol. Plan an experiment, using acidified potassium dichromate(VI) and other reagents, to identify each alcohol.
From Paper 3: Unified chemistry
4(b)4 marks
Explain which of the three alcohols shows optical isomerism, and predict the number of peaks in the ¹³C NMR spectrum of each alcohol.
Score 0 / 56 · 0 of 19 marked
This paper is written by Plasmo in the style of the OCR A-Level Chemistry exam. It is not a past paper and is not produced or endorsed by the exam board.