Drawing and naming the carboxylic acids
2 marks · NormalState the number of carbon atoms AND draw the structural formula of propanoic acid.
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Must show: number: 3, structural formula: CH3CH2COOH
Also accept: Drawing as H−C−C−C−O−H with correct bonds and COOH group fully displayed
Common mistakes: Writing number as 2 or 4; Giving wrong formula e.g. CH3COOH
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Marking points
B1 · 1 mark · States the correct number of carbon atoms: 3
B2 · 1 mark · Draws the correct structural formula: CH3CH2COOH, or equivalent correct drawing
Worked solution
Propanoic acid contains 3 carbon atoms.
Its structural formula is CH3CH2COOH.