O-LevelChemistryOrganic Chemistry5070/21 · May/June 2017 · Q510 Marks
Ethanol and butanol are both alcohols. H H H—C—C—O—H H H ethanol H H H H H—C—C—C—C—O—H H H H H butanol
- (a)Describe the manufacture of ethanol from ethene.[2]
- (b)(i)State one other use of ethanol.[1]
- (b)(ii)Construct an equation to show the incomplete combustion of ethanol.[2]
- (c)Ethanol can be oxidised to form ethanoic acid. Name a reagent that can be used for this oxidation.[1]
- (d)Draw the structure of an alcohol that is an isomer of butanol. Show all of the atoms and all of the bonds.[1]
- (e)Butanol can be converted into an alkene by loss of a molecule of water. Draw the structure of the alkene formed. Show all of the atoms and all of the bonds.[1]
- (f)(i)What type of polymerisation occurs?[1]
- (f)(ii)Poly(butene) is non-biodegradable. What does the term non-biodegradable mean?[1]
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 2017). The mark or mark type is shown in brackets.
- A5(a) Reaction with steam (1)
- In presence of a catalyst (1)
- A5(b)(i) Solvent / making vinegar (1)
- A5(b)(ii) C2H5OH + O2 2C + 3H2O
- OR
- C2H5OH + 2O2 2CO + 3H2O
- Correct products (1)
- Balancing (1)
- A5(c) (Acidified) potassium manganate(VII) / oxygen (1)
- A5(d) ANY ONE FROM
- H H O H
- H-C-C-C-C-H
- H H H H
- H H H
- H-C-C-C-O-H
- H H H
- H H H
- H-C-C-C-O-H
- H H C H
- H
- H
- H O H
- H-C-C-C-H
- H C H
- H
- A5(e) H H H H
- H-C-C-C=C-H
- H H
- A5(f)(i) Addition (1)
- A5(f)(ii) Do not decay / do not decompose naturally / not attacked by bacteria or microbes (1)
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