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O-LevelChemistryOrganic Chemistry5070/21 · May/June 2023 · Q711 Marks

Methanol, propan-1-ol and propan-2-ol are alcohols. The displayed formulae of methanol and propan-1-ol are shown in Fig. 7.1. [Figure 7.1 showing methanol and propan-1-ol displayed formulae]

  1. (a)State the general formula of the homologous series of alcohols.[1]
  2. (b)(i)Propan-1-ol and propan-2-ol have the same molecular formula but different structural formulae. State the name given to compounds that have the same molecular formula but different structural formulae.[1]
  3. (b)(ii)Draw the structural formula for propan-2-ol.[1]
  4. (c)State why propan-1-ol is a saturated compound.[1]
  5. (d)State why propan-1-ol is not a hydrocarbon.[1]
  6. (e)(i)Propan-1-ol reacts in the same way as ethanol. Draw the displayed formula of the product of the reaction of propan-1-ol with acidified aqueous potassium manganate(VII).[1]
  7. (e)(ii)Draw the displayed formula of the product of the reaction of propan-1-ol with ethanoic acid in the presence of a catalyst.[1]
  8. (f)(i)Methanol is a covalent substance. Draw a dot-and-cross diagram to show the bonding in a molecule of methanol. Include only the outer shell electrons of each atom.[2]
  9. (f)(ii)State why methanol does not conduct electricity.[1]
  10. (g)Methanol is used as a solvent. State the meaning of the term solvent.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.

  1. 7(a) CnH2n+1OH (1)
  2. 7(b)(i) (structural) isomers (1)
  3. 7(b)(ii) H3C-C(OH)-CH3 (1)
  4. 7(c) contains only single bonds between carbon atoms (1)
  5. 7(d) contains oxygen (as well as carbon and hydrogen) (1)
  6. 7(e)(i) H—C—C—C—О-Н (displayed formula of propanoic acid) (1)
  7. 7(e)(ii) H—C—C—O—C—C—C—H (displayed formula of propyl ethanoate) (1)
  8. 7(f)(i) 3 C-H bonds and one C–O bond around carbon (1) rest of structure correct (1)
  9. 7(f)(ii) electrons cannot move / all electrons are in bonds
  10. 7(g) (liquid that) dissolves a solute (1)

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About this question

Topic
Organic Chemistry, O-Level Chemistry (syllabus 5070). Structured question, 11 marks.
Source
O-Level Chemistry, May/June 2023 Paper 2 Variant 1, question 7.

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