From Paper 2: Advanced Organic and Physical Chemistry
3(a)4 marks
Compound Y has a molecular ion peak at m/z 72 and a strong IR absorption at 1720 cm⁻¹. It gives no reaction with Tollens' reagent. Its mass spectrum has a large peak at m/z 43. Identify Y, explaining each piece of evidence.
From Paper 3: General and Practical Principles in Chemistry
8(a)6 marks
An organic compound contains 54.5% C, 9.1% H and 36.4% O by mass. Its mass spectrum shows M⁺ at m/z 88. It reacts with sodium carbonate to produce CO₂. Its ¹H NMR spectrum shows a doublet (6H), a multiplet (1H) and a singlet (1H) at δ 11.5. Identify the compound.
From Paper 3: General and Practical Principles in Chemistry
11(d)1 mark
Which IR absorption confirms a carboxylic acid?
From Paper 3: General and Practical Principles in Chemistry
128 marks
A student used thin-layer chromatography to check the purity of aspirin she had made.
(a) Describe how to carry out the TLC and calculate Rf values.
(b) The product showed two spots: Rf 0.62 (matching pure aspirin) and Rf 0.35 (matching salicylic acid). Explain what this shows and how she could purify the product.
(c) Give one other method to check purity, with the expected result for a pure sample.
Score 0 / 19 · 0 of 4 marked
This paper is written by Plasmo in the style of the Edexcel A-Level Chemistry exam. It is not a past paper and is not produced or endorsed by the exam board.
Modern analytical techniques I Exam Questions: Edexcel A-Level Chemistry | Plasmo