Edexcel A-Level Chemistry A2 15.17 Data From Mass Spectra to I Suggest Possible Structures of a Simple Organic Compound Given Accurate Relative Molecular Questions

Use accurate isotope masses, molecular-ion peaks and diagnostic fragments to calculate formulae, assign m/z values and distinguish organic structures.

Exam points

Calculate an accurate relative molecular mass from isotope masses and match it to a high-resolution molecular-ion peak.
Deduce a molecular formula from an accurate molecular-ion m/z value and the permitted elements or carbon count.
Propose charged fragment structures with their m/z values to distinguish organic compounds or structural isomers.
Interpret chlorine-isotope and carbon-13 satellite peak patterns as evidence about molecular composition.

[Maximum number: 1]

This question is about carboxylic acids and their derivatives.

An organic compound E contains carbon, hydrogen and oxygen only.

The accurate relative atomic masses, $A_{r}$ , of the three elements in E are shown in the table.

Table for Question Edexcel A-Level Chemistry A2 15.17 Data From Mass Spectra to I Suggest Possible Structures of a Simple Organic Compound Given Accurate Relative Molecular Questions question 1 — Edexcel A-Level Chemistry A2

E contains five carbon atoms and gives a molecular ion peak at m / z=102.0678 in its mass spectrum.

Deduce the molecular formula of E.

$\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2}$

Allow symbols in any order

Ignore any working Ignore + charge

(1)

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Edexcel A-Level Chemistry A2 15.17 Data From Mass Spectra to I Suggest Possible Structures of a Simple Organic Compound Given Accurate Relative Molecular Questions question 1