CAIE A Level Chemistry 9701 · Hydroxy compounds

Hydroxy compounds: explain question

Explain4 marksStandard

Butanone, CHX3COCHX2CHX3\ce{CH3COCH2CH3}, and butanal, CHX3CHX2CHX2CHO\ce{CH3CH2CH2CHO}, can each be reduced to an alcohol using NaBHX4\ce{NaBH4}.

Explain how the structures of butanone and butanal affect the type of alcohol formed in each reduction. In your answer, include the conditions needed for the reaction and identify the type of alcohol formed from each compound.

0 words · 4 marks

No account needed for your first marks. Your answer is used only to mark it.

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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