Edexcel A-Level Chemistry A2 15.9 The Nomenclature of Carboxylic Acids Questions

Review A-Level Edexcel Chemistry carboxylic acid nomenclature through IUPAC names, E/Z acid notation and structural isomer drawing.

Exam points

give IUPAC names for hydroxy carboxylic acids such as lactic or salicylic acid
name unsaturated acids with E/Z notation and double-bond locants such as vaccenic acid
draw carboxylic acid structural isomers using carbonate, NMR and chirality evidence

[Maximum number: 4]

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

Isomers A, B, C and D are structural isomers that all react with aqueous sodium carbonate to produce carbon dioxide.

Isomer A is a straight-chain compound.
Isomer B has only two peaks in its high resolution proton NMR spectrum, both of which are singlets.

Isomer C contains a chiral centre but isomer D does not.
Give the structures of these four isomers.

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Edexcel A-Level Chemistry A2 15.9 The Nomenclature of Carboxylic Acids Questions question 1