Chemistry · May / June 2020 · Paper 41 · Question 5
0620
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Ethanol is manufactured by two different processes.
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5(a)[4]
M1 sugar(s)
M2 fermentation
M3 ethene
M4 hydration
5(b)[1]
(acidified) potassium manganate(VII)
5(c)(i)[1]
(Liebig) condenser
5(c)(ii)[1]
arrow at the lower inlet
5(d)(i)[2]
methanal
C4H8O
5(d)(ii)[1]
CnH2nO
5(e)(i)[1]
functional group
5(e)(ii)[3]
M1 4 × C–H dot cross bonds and 1 C–C dot cross bond
M2 1 × C=O dot cross bond
M3 non-bonding electrons on O
5(f)(i)[1]
(structural) isomers
5(f)(ii)[2]
M1 any structure with correct valencies and formula of C3H6O
M2 C=O bond on second carbon (of a chain of 3)
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