Coding for branched chains
2 marks · EasyA molecule contains two side chains: one methyl and one ethyl. How many carbon atoms are in the side chains combined?
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3 (±0)
Also accept: three
Common mistakes: 2; 4
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Marking points
M1 · 1 mark · Counts carbons in methyl and ethyl side chains.
A1 · 1 mark · Gives correct total: 3. (follow-through)
Worked solution
A methyl side chain has 1 carbon, ethyl has 2. The total is 1 + 2 = 3.