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Edexcel A-Level Chemistry A2 20.1 Deduce the Empirical Formulae Molecular Formulae and Structural Formulae From Data Drawn From Combustion Analysis Element Questions

Practise Edexcel IAL Chemistry 20.1 by converting combustion data to formulae, interpreting functional-group tests and spectra, then checking the final organic structure.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Calculate empirical formulae from CO2, H2O and oxygen-by-difference data.
  • Use functional-group tests and IR, MS, 13C NMR or proton NMR to justify structures.
  • Deduce structural formulae from empirical formulae, molecular formulae and test evidence.

Edexcel A-Level Chemistry A2 20.1 Deduce the Empirical Formulae Molecular Formulae and Structural Formulae From Data Drawn From Combustion Analysis Element Questions question 1

[Maximum number: 4]

This question concerns six isomers each with the molecular formula C5H10O2\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2}.

Isomer F is a neutral compound that smells of pears.

It can be formed by the reaction between compounds V and W in the presence of concentrated sulfuric acid.

Compound V has an absorption in its infrared spectrum at 1720 cm−11720 \mathrm{~cm}^{-1} and a broad absorption around 3050 cm−13050 \mathrm{~cm}^{-1}.

Compound W can be formed directly from propanal.

Identify, by name or formula, compounds V, W and F.

Justify your answer by using all the available information.

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