Drawing and naming the carboxylic acids
4 marks · NormalThe table shows several unbranched carboxylic acids:
| Name | Molecular formula |
|---|---|
| methanoic acid | CH2O2 |
| propanoic acid | C3H6O2 |
Write the name and structural formula of the carboxylic acid with the molecular formula C2H4O2.
State the number of carbon atoms in butanoic acid and write its name following IUPAC conventions.
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(a) ethanoic acid, structural formula: CH3COOH · must show name: ethanoic acid, structural formula: CH3COOH
(b) 4 carbon atoms, name: butanoic acid · must show states 4 carbons, IUPAC name: butanoic acid
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Marking points
B1 (a) · 1 mark · Gives name: ethanoic acid
B2 (a) · 1 mark · Gives correct structural formula: CH3COOH
B3 (b) · 1 mark · States the correct number of carbon atoms: 4
B4 (b) · 1 mark · Gives correct IUPAC name: butanoic acid
Worked solution
a) Name: ethanoic acid. Structural formula: CH3COOH.
b) Butanoic acid contains 4 carbon atoms. Name: butanoic acid.