A-Level ChemistryYear 2019Q23
page 10 23. A student attempted to predict the mass spectrum of propanone. The predicted spectrum is shown below. intensity m/z 5 10 15 A B C D 20 25 30 35 40 45 50 55 60 The actual mass spectrum of propanone contains only three main peaks. Which of the above peaks would not appear in the actual mass spectrum? 24. Analysis of a compound shows the following percentage composition by mass. C = 80·0% H = 9·3% O = 10·7% The empirical formula for this compound is A C10H14O B C14H10O C C14H20O D C20H14O. 25. H O C H H H C H H Which of the following splitting patterns would be observed for the circled atom in the high resolution 1H NMR spectrum of ethanol? A Doublet B Triplet C Quartet D Quintet
Paper Source:NAH_Chemistry_all_2019.pdf
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Exam Specification Info
This question is part of the UK A-Level Chemistry syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
Syllabus levelAdvanced Level (A-Level)
SubjectChemistry
Official MarksVariable (2–6 marks)