Structural isomerism in the alkanes
2 marks · EasyPropane (C3H8) has no structural isomers. Predict and state the number of structural isomers for butane (C4H10).
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2 (±0)
Common mistakes: Incorrectly stating 1
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Marking points
M1 · 1 mark · Identifies that adding one more carbon to propane allows a branched structure
A1 · 1 mark · Correct answer: 2
Worked solution
Butane (C4H10) can exist as two structural isomers: a straight-chain and a branched (methylpropane). So the answer is 2.