Chemistry · Oct / Nov 2020 · Paper 42 · Question 5
0620
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This question is about alcohols, carboxylic acids and esters.
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5(a)(i)[1]
presence of an acid
5(a)(ii)[1]
oxidation
5(a)(iii)[3]
all single bonding dot and cross pairs correct (1)
double C=O bond dot and cross pairs are correct (1)
Complete diagram is correct (1)
5(b)[6]
partial (dissociation) (1)
full / 100% (dissociation) (1)
both acid colours (1)
HCl indicating a lower pH acid colour than CH3COOH (1)
fizzing OR dissolving / disappearing in both (1)
either observation happens quicker with HCl (1)
5(c)(i)[1]
water
5(c)(ii)[1]
acid (catalyst)
5(c)(iii)[2]
any one alcohol group on a molecule (1)
structure of propan-2-ol (1)
5(d)(i)[1]
the atoms / group of atoms which give (any molecule its) chemical properties
5(d)(ii)[1]
C3H5O2
5(d)(iii)[2]
Mr of HO–CH2–CH2–OH = 62 (1)
%ge = 100 × 32/62 = 52% (1)
5(d)(iv)[2]
any correct ester link between any two blocks showing all atoms and all bonds (1)
correct orientation of 3 inter-block ester links and continuation bonds (1)
5(d)(v)[1]
Terylene
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