CAIE IGCSE Chemistry 11.2 Naming Organic Compounds Questions

Practise naming and drawing organic compounds from carbon-chain length, functional group and position, including alkanes, alkenes, alcohols, acids and esters.

Exam points

choose the chain-length stem and suffix from the main functional group or homologous series
number the chain to give a double bond or functional group the correct lowest position
name esters from the alcohol-derived alkyl group followed by the acid-derived alkanoate

Covered syllabus points

11.2.1—Displayed formulae of: (a) methane and 11.2.2—Type of compound present, given a 11.2.3—Structural and displayed formulae of 11.2.4—Displayed formulae of the unbranched

[Maximum number: 1]

Which formula represents ethanol?

$\mathrm{CH}_{3} \mathrm{CH}_{3}$

$\mathrm{CH}_{2} \mathrm{CH}_{2}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$

$\mathrm{CH}_{3} \mathrm{COOH}$

[Maximum number: 1]

A molecule of compound P contains two carbon atoms and four hydrogen atoms.
Which row represents P ?

name of
compound

$M_{r}$

reacts with
aqueous bromine

ethane

ethene

✓

ethene

✓

ethene

[Maximum number: 2]

Many organic compounds contain carbon and hydrogen only.

Carboxylic acids and esters contain carbon, hydrogen and oxygen only.

An ester X and a carboxylic acid Y both contain 3 carbon atoms.
X and Y have the same molecular formula.

Draw the displayed formula of carboxylic acid Y. Name the carboxylic acid.
name

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Covered syllabus points

Question 1

Question 2

Question 3