Explain4 marksStandard
Butan-2-ol can be converted to but-2-ene by dehydration. State the reagent and conditions for this reaction, and explain why but-2-ene, rather than but-1-ene, is the major product.
CAIE A Level Chemistry 9701 · Hydrocarbons
Hydrocarbons: explain question
How this question is marked
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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