Chemistry · May / June 2021 · Paper 41 · Question 7
0620
As printed in the paper
The question as text
Many organic compounds contain carbon, hydrogen and oxygen only.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
7(a)[3]
48.65 / 12 8.11 / 1 43.24 / 16 (1)
OR evaluation
4.05 8.11 2.7(0)
divide all by smallest
OR 1.5 : 3 : 1
OR 6 : 3 : 2 (1)
C3H6O2 (1) ALLOW symbols in any order
7(b)[1]
(Mr of CH4O = 32)
CH4O (1)
7(c)(i)[1]
CnH2nO2
OR
CnH2n+1 COOH
7(c)(ii)[3]
butanoic acid (1)
fully displayed carboxylic acid group (1)
correct structure of butanoic acid showing all atoms and bonds (1)
7(c)(iii)[1]
homologous series
7(d)(i)[1]
brown to colourless
7(d)(ii)[2]
C9H20 (1)
2C3H6 (1)
7(d)(iii)[1]
addition
7(d)(iv)[2]
any one repeat unit (1)
both repeat units fully correct (1)
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.