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O-LevelChemistryOrganic Chemistry5070/21 · May/June 2021 · Q16 Marks

Choose from the following compounds to answer the questions. H | H3C-C-C—O-H | H A H | H3C-C-CH3 | H B H | H3C-C-C-O—H | H C H3C | C=CH2 | H3C D H | H3C-C-CH3 | CH3 E H | H—O—C—C—O—H | CH3 F H | H3C-C-C-O-CH-CH3 | H CH3 G Each compound may be used once, more than once or not at all.

  1. (a)(i)has a molecule with only 14 atoms[1]
  2. (a)(ii)can be oxidised to form propanoic acid[1]
  3. (a)(iii)is an isomer of butane[1]
  4. (a)(iv)reacts with steam to make an alcohol[1]
  5. (a)(v)can be polymerised to make a polyester.[1]
  6. (b)State which two compounds in aqueous solution turn blue litmus red.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.

  1. 1(a)(i) E
  2. 1(a)(ii) A
  3. 1(a)(iii) E
  4. 1(a)(iv) D
  5. 1(a)(v) F
  6. 1(b) C and F

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About this question

Topic
Organic Chemistry, O-Level Chemistry (syllabus 5070). Structured question, 6 marks.
Source
O-Level Chemistry, May/June 2021 Paper 2 Variant 1, question 1.

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