O-LevelChemistryOrganic Chemistry5070/22 · May/June 2020 · Q66 Marks

The structures of two alcohols are shown. [Figure showing the structural formula of ethanol (CH3CH2OH) and alcohol B (CH3CH2CH2CH2OH, butanol)]

(a)What is the name of alcohol B?[1]
(b)Draw the structure of one other alcohol which is an isomer of B. Show all of the atoms and all of the bonds.[1]
(c)Ethanoic acid is produced by the oxidation of ethanol. State the reagent for this reaction.[1]
(d)Ethanol is a simple molecular compound. Explain why liquid ethanol does not conduct electricity.[1]
(e)Ethanol can be dehydrated to form ethene, C2H4. Describe, using a dot-and-cross diagram, the bonding in a molecule of ethene. Only include the outer shell electrons.[2]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Mark scheme

Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.

[1] 6(a) butanol (1)
[1] 6(b) [diagram showing an isomer of butanol] (1)
[1] 6(c) oxygen / (acidified) potassium manganate(VII) (1)
[1] 6(d) electrons cannot move / no mobile electrons (1)
[1] 6(e) two shared pairs of electrons between both carbon atoms (1)
[1] 6(e) two shared pairs between carbon and hydrogen atoms for each carbon atom (1)

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